What is the difference between the M1 and the M2?

The M1 will no longer be made, the M2 is simply the evolution of the wearable SubPac product.  It is slimmer with improved fit and accuracy which makes it a stylish product you can use anywhere, anytime.  It features Bluetooth 4.0, more powerful transducers, longer battery life, lighter weight, and a flexible strapping system.  


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