Recommendation from a German customer: The SA628F22 walkie-talkie moduleis used for bicycle riding.

I ride a lot with my wife bicycle, with self-built e-bike, because they can not keep up with those in the trade. And I was looking for an intercom that I can only turn on once, at the beginning of the bike tour and then talk without pressing a button, of course there is no such thing in Germany. That means building yourself, as always. I have 3-batteries AA 1.5 9800mWh lithium-ion and come, with it, over 8 hours, tested with music. After eight hours still 36 percent battery was standing. G-NiceRF NiceRF SA628F22 is simply great for everyone recommended, full duplex speech module.