You can charge by USB, I believe it is USB micro C, but it also has a two place cradle to charge two units, since it comes packaged with two units. It has rechargeable Ni-Cads which come with the unit, and also accepts 3 AAs.
I’m a 49 year old with his first walkie talkie. lol. Anyway, great video on this product. I got these because when we go out on the lake or beach area I want to connect to the riders on my Yamaha Waverunner. I got tired, and afraid of loosing my phone in the water. Just got these in so can’t really comment on how they work. Any recommendations for us who will be using these on the water. Thanks again.