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ReSound Key 4 Hearing Aid

Original price £299.00 - Original price £550.00
Original price
£299.00 - £550.00
Current price £299.00
Which Ear: Left

Meet the ReSound Key 4, a device for mild to moderate hearing loss.

Great for everyday listening, TV, and small group situations, with clear sound and premium audiological features.

Easy to use with a simple rocker switch for volume and program change.

Blue Tooth compatible for both Android and iPhone. A user-friendly app that is easy to navigate and simple to use.

Resound Key 4 delivers a clear natural sound quality perfect for joining conversations in all environments.

Each device comes with a selection of fitting tips in small, medium, and large.

Size 2 tubing as standard (additional tubing sizes are available for comfort if required.)

For the full range of compatible accessories click here

So much on offer – do contact our audiologists to discuss the best set up for your needs. Our audiology team is always happy to help you. Call them today on 0800 0321301 / 01264 313110 or email them at

Whats in the Box? 
The Resound Key 4 is sent with everything you will need to try the aid at home:

  • Hearing aid storage case
  • Pack of 6 size 13 batteries – each battery will last an average of 8 days
  • Size 2 Resound Surefit Thin Tube
  • Resound Surefit domes
  • Cleaning wire
  • Cleaning brush (there is a magnet on one end to help with battery removal)
  • User guide
Key Features

Looks and size

It is shaped to sit snugly behind your ear, with a thin silicon-plastic tubing directing the amplified sound into the ear canal. A ‘dome’ is attached to the end of the thin tubing, helping the thin tubing sit comfortably in the ear canal. The thin tubing should sit close to the side of the head, and when in place correctly, offers a discreet fitting. The tubing size is printed on each piece for easy identification and colour coded – red for the right-sided tubing and blue for left sided tubing.  


The Resound Key offers a host of sound processing features including:  

  • 16 sound processing channels – providing a clear reproduction of incoming sound.
  • 4 listening programmes – can be configured to your unique listening needs.
  • Noise reduction – enhancing listening comfort. 
  • Tinnitus program (On request)
  • Direct streaming for iPhone calls (controlled via the Resound Smart 3D App)


2 Year Hearing Aid Warranty

The warranty covers manufacturing and material defects in the hearing aid itself. Upon inspection Hearing Direct will either repair or exchange the hearing aid with a new or refurbished like for like unit at their sole discretion.

Warranty Limitation

This warranty does not cover damage from improper handling or care, exposure to chemicals or undue stress. Damage caused by third parties or non-authorized service centre’s renders the warranty null and void.

Out of Warranty Hearing Aid Repair

If your hearing aid is out of warranty Hearing Direct will inspect the device and either repair or replace it with a fully refurbished device for £250.00 Out of warranty repairs are guaranteed for a period of 6 months. (Please note this will only cover mechanical failure of the device for up to 4 years from the original purchase date)



United Kingdom Delivery Options and Prices

For hearing aids, we aim to program and dispatch within 5 working days of receiving your order. If we are unable to do this for any reason, we will contact you.
Delivery Option Price Estimated Delivery Time
Royal Mail Tracked 48 £3.49 (FREE On Orders Over £35)

3 - 5 working days

Royal Mail Tracked 24 £3.99 (Only £1.50 on orders over £35)

1 - 2 working days

Fully Tracked Special Delivery by 1pm £9.99 (On all orders taken by 15.00) Free on Hearing Aids Guaranteed next working day by 1 pm

International Delivery 

Delivery Option Price Estimated Delivery Time
Royal Mail International (Standard) £6.99 5 - 10 working days
Royal Mail International (Express) £12.99 3 - 4 working days

Please note that orders must be placed by 12pm Monday to Friday to guarantee next-day delivery. Orders are also not shipped over the weekend. 

Delivery of the Goods will be made to the address provided by you at the time of placing your Order.

If your Goods are not delivered safely within a reasonable number of days of you receiving notification of dispatch, you should contact us. Customers should promptly inspect goods delivered to them to satisfy themselves that any goods delivered to them are as expected.


Our 30-day, money back guarantee is exactly that - if you are unhappy with any item you have bought from Hearing Direct International, you have the right to return within 30 days after it has been dispatched, for a replacement or full product refund.

What do I need to know about returning a phone or assistive listening device?

These products may be unwrapped for testing but if they prove to be unsuitable then a 100% refund will be issued only if the product is returned in a brand new, saleable condition, with all packaging and contents intact. 

N.B. We would not consider an item to be re-saleable if:

  • The box or contents are dirty or damaged.
  • Personal data or phone numbers have been added.
  • The original contents are damaged or missing.

Any phone that requires re-packing, to ensure it is as new, will attract a nominal charge of £7.50 that will be deducted from the refund. All returns will be quality assessed prior to refunding.

What do I need to know about hearing aids?

Hearing aids can be fully tested in ear; if the fit or sound is not satisfactory, they can be returned within 30 days of receipt for a full product refund. Used accessories such as batteries, domes or wax guards do not need to be returned. If physical damage beyond expected trial use is found on the hearing aid, our standard repair charge of £60 will be deducted from your refund as this affects our return policy with the supplier. 

What do I need to know about returning hearing aid accessories?

These products must be returned, in their original packaging, un-opened and in a brand new, saleable condition. All returns will be quality assessed prior to refunding.

Please note we are unable to accept returns outside this 30-day period unless the item is deemed faulty, in which case, a replacement or repair of the faulty item will be offered. 

To return goods you need to contact us to obtain a Return Authorisation Number (RAN). 

You can request a RAN by emailing or calling us on 01264 313110 or 0800 032 1301. The RAN should be quoted on an accompanying letter to explain the reason for return and ideally a copy of the original invoice. We recommend you obtain proof of postage from the post office when returning any item to us.

You will be notified by email or in writing when your returned goods have been received by us.

For more details, see "Your right to cancel", in the terms and conditions. Your statutory rights are not affected.

When does the 30-day period start?

We will stamp your receipt with a date when we put it in the post. The 30-day period will start from this date; returns must have a posting date no more than 30 days after this dispatch date.

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Behind the Ear

Sits behind the ear

hearing direct programmable


Programmable to an audiogram

hearing direct volume


Adjustable volume

hearing direct battery


Size 13 /

Is the ReSound Key 4 Hearing Aid right for you?

Pros Cons
  • Easy to use with a simple rocker switch for volume and program change.
  • Each device comes with a selection of fitting tips in small, medium, and large.
  • Blue Tooth compatible for both Android and iPhone. A user-friendly app that is easy to navigate and simple to use.
  • 2-year warranty

Not quite right?

Compare to other Behind the Ear hearing aids

Price (Each) Programmable Volume Control Moisture Resistant Noise Reduction Speech Focus Battery
HD Bliss 2 £125.00 Rechargeable
HD Bliss 4 £160.00 Rechargeable
ReSound Join £399.00 Rechargeable
ReSound Key 4 Hearing Aid £299.00 Size 13
Resound Linx Quattro 5 £699.00 Rechargeable
Resound one 5 Hearing Aid £1,195.00 Rechargeable
Signia Motion 13 1Nx £299.00 Size 13 7-8 days
Signia Pure Charge&Go 1AX £695.00 Rechargeable Charge last up to 24 hours
Signia Pure Charge&Go 3AX £995.00 Rechargeable Charge last up to 24 hours
Signia Pure Charge&Go 7AX £1,395.00 Rechargeable Charge last up to 24 hours
Styletto 1X Rechargeable £499.00 Rechargeable 17 hours of use per charge
Unitron Moxi Blu 3 Hearing Aid £945.00 Rechargeable
Unitron Moxi Blu 5 Hearing Aid £1,195.00 Rechargeable
Unitron Moxi Blu 7 Hearing Aid £1,225.00 Rechargeable
Unitron Moxi Blu 9 Hearing Aid £1,750.00 Rechargeable


Some of our customers' experiences


How do I know if it will fit my ear?

The medium length tubing included as standard fits more than 85% of our customers comfortably - but we will send out a shorter or longer tubing if need be. A number of different sizes and styles of dome designs can also be used. A smaller dome can help to minimise the ear canal feeling blocked up; but a bigger dome may be required to prevent amplified sound leaking back out the ear canal and creating feedback (whistling).

How do I know if the sound will be right for me?

If you have a copy of a hearing test available you can send it to us and we can confirm if the Resound LiNX Quattro can cover your hearing loss. If you order without providing a hearing test result, you will be trying out its standard settings, which cater for mild to moderate, mainly high frequency hearing loss.

What if it doesn't work for me?

If anything about the physical fitting or sound is not to your liking, you can return the Resound LiNX Quattro for a full refund within the first 30 days of receipt. Do of course feel free to contact us to see if the problem can be resolved with a fine tuning.

Should I get one or two?

If an evaluation by a hearing professional indicates that you have hearing loss in both ears, and especially where the degree of loss is similar, two hearing aids are usually recommended.

While it may be tempting to try to limit the cost by going with a single hearing aid, wearing just one hearing aid may not give you maximum benefit in some difficult listening situations.