... size 3.built-in rechargeable battery 4.one button control micro bluetooth receiver easy pairing with iPhone iPad cellphones laptop Product ... ), or 20 Meters(outdoor)*Battery type: Li-ion, 3.7V, 150 mAh*Battery working time: 5 hours*Battery charging time: 2 ... , 3.5mm to 3.5 mm audio converter, user manual micro bluetooth receiver easy pairing with iPhone, iPad, cellphones, laptop