Bluetooth version: 4.0CSR8640 chip; Working frequency range: 2.4GHz~2.48GHz; Transmission power: Class 2 up to 10 meters; Supports: music playing(A2DP)streaming media control (AVRCP)hands-free calls (HSP HFP); Supports card type: TF card; Working time: about 5 hours; Connector: 5P micro USB; Output power: 7.5W x 2THD=1%; Input sensitivity: 800mV1kHz;Sound volume: 95dB+/-3; Operating temperature:+10'~+40'; Charing time: about 3 hours; Charging voltage/current: DC 5.0V / 1000mA; Li-polymer battery: 3.7V 3000mAh; Extra functions: support LINE-IN NFC hands-free calls and TF; Fashionable design; High-quality sound effects; Fine workmanship; With built-in microphone; With 3.5mm jack plug you can connect this product to any device to play music.