Model: OT203 BT version: BT5.3 Charging input: DC 5V-500mA Headset battery capacity: 25mAh Audio decoding protocol: SBC/AAC Charging box standby time: 90 Days Headset charging time: About 1.5 hour Charging box battery capacity: 250mAh Support protocol: A2DP/AVRCP/HFP/HSP