We bought these for our walkie son for Christmas and have therefore made a test. The talkies are not rechargeable battery but by the foundation on which we must lay the talkies. To speak you have to press the button and wait a few seconds before speaking if the other person does not entent what is said. And all this is the discovery as there is no manual. We have not made the test of 10 km but we did not buy them for that, fortunately. But they are: small, light and the air so solid to do with use.
