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Product information: [Material]: ABS PC TPU [Interface specification]: 3.5mm,Type-C [Product solution]: AD1319XC QFN32 4*4 Jie Li [Bluetooth version]: 5.1 [Bluetooth device name]: ES-BT10 [Transmission distance]: 10m [Operating frequency]: 2.402G-2.48G [Working power]: 1 6dbm [Battery capacity]: 140mAh [Charging power]: DC 5V/150mA [Charging time]: 1.5 hours (when charging, the indicator light is red and long, full and off) [Standby duration of transmitting music playback]: 7 hours [Standby duration of receiving music playback]: 8 hours Size:19.95*12.05*96.69mm