Listen up personal sound amplifier, amplified sound anywhere,you can hear ... Battery Capacity: 90 MAHUnit weight:20g(including built-in rechargeable battery)Item No.: BH081-B *Included rechargeable ... 60 MAHUnit weight:20g(including built-in batteries)Features: * The product is an amplifier, It's so powerful, you ... medium, small) are suited with different earholes separately In Ear Amplifier (BH081A/B/C)