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What is it?
Can be used with?
The size and power level are shown on the housing of the receiver itself (at the bottom end of the tubing). A number and a letter indicate the size and power level of your existing receiver tubing (Standard, Medium or Power). If you require another power level, take a look at Standard Power (S) mini-Receiver tubing 2.0 or High Power (P) mini-Receiver tubing 2.0.
The earlier receiver tubing version, Siemens 1.0, is available here.