Output power: 1 KHZ THD10 %USB device function: for the machine charge. Frequency response: 170 hz - 20 KHZTF card、 support MP3 songsSpeaker: solid double trackBluetooth connection broadcast functionSignal to noise ratio: 90 db or higherFM radio FM digital radio、 radio broadcast memory.Lithium battery: 4.2 V600mA/H batteryThe whole machine working time about 4 to 5 hoursMaterial: ABS + silica gelRated charging time: about 3-4 hoursDistortion: 1% or lessRating: 3 wA bluetooth connection distance: 10 meters or moreOperating voltage: 3.7 VProduct size: 146 * 54 * 31 mmCharging voltage: dc 5 vItem 300 G in weightBluetooth hands-free mobile phoneThe last time allocated calls the callback functionAccessories mountaineering buckle 1、 audio data line 1、 line 1 a、 1 in this manual