eatures: Children Electronic Piano Set: includes a small electronic piano, an USB cable, a mini microphone for singing while playing piano and an audio cable. It helps develop kids' interests in playing piano. Dual Power Supply Methods: powered by 3 AA batteries(not included) or external USB cable, suitable for both home and outdoor activities such as camping, picnic, etc. Portable & Lightweight: weighs less than 500g, suitable for children above 3+ to carry by themselves to develop independence. Equipped with Microphone: the mini microphone is a nice accessory for your kids to sing while they playing. BF-430A1 37 Keys: Material: ABS Key: 37 keys Tone: 8 Kinds Rhythm: 8 Kinds Demo: 6 Songs Percussion: 4 Percussion Volume Control: Support Tempo Control: Support Animal Song Effect: Support Song Record: Support Song Play: Support Powered: 3 * 1.5V AA battery (NOT included) or USB cable Microphone Size: 107 * 34 / 4.33 * 1.34in Item Size: 430 * 163 * 53mm / 16.93 * 6.42 * 2.09in Item Weight: 469g / 1.03lb Package Weight: 611g / 1.35lb Package Size: 43.5 * 17 * 6cm / 17.13 * 6.69 * 2.36in   BF-530A1 49 Keys: Material: ABS Key: 49 keys Tone: 16 Kinds Rhythm: 8 Kinds Demo: 6 Songs Volume Control: Support Tempo Control: Support Program: Support Record: Support Play/Sound Effect: Support One Key for One Note: Support Fill-in: Support Single Finger Chord Powered: 3 * 1.5V AA battery (NOT included) or USB cable Microphone Size: 107 * 34 / 4.33 * 1.34in Item Size: 528 * 187 * 55mm / 20.79 * 7.36 * 2.17in Item Weight: 605g / 1.33lb Package Weight: 791g / 1.74lb Package Size: 53 * 19 * 5.8cm / 20.87 * 7.48 * 2.28in Package List: 1 * Electronic Keyboard 1 * USB Cable 1 * Microphone Note: The horn on the right is just for decorative, while the left one is the sounding speaker.