97mAh built-in battery Working distance: 10 meters Charging port: Micro USB Wireless connection: Bluetooth version 4.2 Input parameters: 5V1A Implementation of the standard: Q / WMSX007-2017 CMIIT ID: 2017DP3366 Bluetooth protocol: HFP / HSP / A2DP / AVRCP Compatible with external headphones: support 3-segment 3.5mm plug stereo headphones; support 4-segment 3.5mm plug GB and American standard phone headset (OMTP / CTIA automatic identification switch)