- Built-in powerful and safe Li-Polymer rechargeable battery to charger anytime as needed - Talk time: Up to 5.5hours - Video playback: up to 6 hours - Audio playback: up to 20 hours. - Standby time: up to 350 hours. - Input voltage: 5V - Charge current: 500mA. - Output voltage: 5V - Output current: 500mA. - Battery capacity: 1500mAh - Power consumption: 5V/2.5W - Working temperature: -15 – 55.