Specification: Material:ABS+Metal;  Color:Black;  Interface Type:USB;  Connection:3.5MM AUX- IN;  Power supply:USB output or 6X AAA batteries;  Starting current:about 135mA;  INPUT input impedance:1M;  AUX IN input impedance:10K;  Signal to noise ratio:88dB;  Maximum output power:3.2W RMS;  Rated power:4.2W;  Speaker:4,5W;  Speaker size:3 inches;   Frequency response:40-16KHz;  Power:DC9V (internal negative external positive) / AA battery *6 / USB5V;  Bluetooth:4.2;  Bluetooth distance:10m;  Size:166mm 98mm 124mm;  Weight:720g;    Feature: -Mini/Micro Battery Powered Portable Guitar Amp.  -Works with headphones.  -Great for portable and lightweight and convenient guitar playing.  -Despite its size, you never struggle to hear it ? it's easily enough to be a practice amp.  -There's also a slot which you can attach your headphones into if you want to play in silence.  -Works with both electric guitars and bass, however performing best with standard guitars.    Lite BT firmware update instruction: 1.Connect USB port with PC/MAC, plug power adaptor.  2.Open DFU (updater software).  3.Hold TAP button and Power On.  4.DFU will find Mighty Lite Device, then select .bin file and start update.  5.DFU will show update status, while finish, repower Mighty Lite.  6.Enjoy it     Note: The mighty lite app can upload in the apple store.    Package Included: 1xGuitar Amplifiers;  1xPower Cable