Extended memory maximum support: 16GB Frequency response: 150Hz-20KHz Output power: 3W * 2 Bluetooth: Standard RDA 3.0 Frequency: 2.402-2.480GHz Microphone sensitivity:-38db Speaker sensitivity better than:-82dBm Range: 10 meters Working voltage: DC3.7-4.2V Working current: 150mA Power supply built-in 3.7V,350mAh lithium ion battery Charging voltage: DC4.8-5.5V,200mA Charging time 2.5 hours More than 2.5 hours of music playback time More than 4.5 hours of hands-free talk time Standby time more than 10 hours Model: A10 Color: black, gold, silver, rose gold (optional) Size: 71.2 (diameter) x 42.5 (height) mm Weight: 154g Specifications: Features: 1. The use of aluminum alloy shell, high quality and durable 2. Fashion simple cylindrical design, full of modern sense 3. Support Bluetooth call hands-free 4. Support Bluetooth music/TF card music/external music auxiliary input 5. Stereo and bass sound effects 7. Shell material aluminum alloy Package Included: 1 * Bluetooth speaker 1 * USB cable