Feature:1. 37 Keys Design: The keyboard features 37 keys, offering a compact and portable design for easy carrying and playing anytime.2. 32 Note Polyphony: Equipped with 32-note polyphony, it is ideal for beginners, allowing smooth playback of continuous notes without cutoff.3. Built-in Lithium Battery: Powered by an integrated lithium battery, the 37-key keyboard can be turned on and used immediately.4. Natural Stereo Sound: Utilizes advanced wave memory stereo sampling to deliver realistic instrument tones in high-quality stereo audio.5. Multifunctional Controls: Includes volume control, demo song playback, stop function, audio input jack, headphone output, microphone input, and single speaker output.Specification:Item Type: 37 Key Keyboard PianoBattery: Built-in lithium battery 3.7V 1200mAhProduct Dimensions: Approximately 55 x 11.2 x 3.8 cm / 21.7 x 4.4 x 1.5 inFunctions: 4 voices, 10 demo songs, volume adjustment, demo song playback, stop button, volume knob, audio jack, headphone jack, microphone input, single speaker.Package List:1 x Electronic Keyboard1 x Strap1 x USB Cable1 x Connection Cable1 x Microphone1 x User Manual