Model: SY-TWS1 Bluetooth Version: 5.0 Power Input DC 5V Earphone Working Time: About 2 hours Earphone Charging Time: About 1 hours Charge Time: About 2-3h Earphone battery capacity: 35mAh Charging Case battery capacity: 400mAh Support Protocol: HSP/HFPIA2DP/AVRCP Sensitivity: 108+/-5dB Frequency response: 20-20000 HZ Impedance: 32 ohms