Features: 1.Built in Lithium Battery: The portable electronic piano keyboard has a built in large capacity rechargeable lithium battery, which is convenient for outdoor playing. 2.Teaching Function: The piano keyboard is equipped with 3 teaching modes with a variety of function keys, which is very suitable for beginners to learn. 3.Multiple Interfaces: Built in dual speakers and multifunctional interfaces, microphone, audio input function, can also be connected to a mobile phone for playback. 4.Recording and Playback: 37 key piano has recording and playback function, can also help performers recall performance effects and make targeted connections. 5.Multifunctional Button: With 200 tones, 200 rhythms, 50 demos and volume or speed control buttons, and the LED screen can simply and clearly display the status. specification:Item Type: Portable Electronic Keyboard Product Size: Approx. 525 x 218 x 58mm / 20.7 x 8.6 x 2.3in Battery Type: Lithium battery 3.7V 1200mAh (built in) Functions: 200 tones, 200 rhythms, 50 demo songs, pitch adjustment, rhythm adjustment, volume adjustment, metronome, LED display, recording, playback, microphone function, audio jack, headphone jack, microphone function, single trumpet PackageList: 1 x ElectronicPiano 1 x Microphone 1 x USB Cable 1 x Connection Line 1 x User Manual