General Bluetooth Solution: CSR Bluetooth Version: 4.1 Operating Range: 10 Meters Battery: Charge battery, built-in 120 mAh polymer lithium battery Talking Time: About 8 Hours Standby Time: Up to 45 Days Charge Time: About 1 to 2 Hours Bluetooth Sports Headphones NFC Sweat Proof 120 mAh polymer lithium battery