The moisture meter can quickly measure the moisture content of the grain. 1. Universal to use: portable roll-up piano for all ages; with 88 keys (A1-C9) standard piano; with Bluetooth MIDI function for APP connection. 2. Multiple settings: roll up the digital piano with 128 tones, 128 rhythms, 14 demo tracks with Bluetooth connection. 3. Multifunctional: portable electric piano with recording, editing, playback, sustaining, vibrato, teaching, chords, etc. 4. Easy to use: portable piano with digital LED display; standalone playing with its own speaker; supports external sound or headphones; external sustain pedal is available. 5. Power supply: The digital piano can be powered by rechargeable lithium battery, external DC 5V power supply or mobile charging power supply; MIDI output support can be used with computer or tablet connection. Specification: Item Type: Retractable Piano Material: natural silicone, ABS Black color Output power: 500 mW Applicable voltage: 100-240 V Power mode: 1. Built-in power supply with lithium battery 2. External power supply USB Battery type: Built-in 1100 mAh lithium battery (included) List of packages: 1 x Host 1 x Power Cord 1 adapter 1 x Sound Extension Pedal 1 x Manual Note: When practicing piano, you need to lie flat. Plug and play