Check the listing for details. Realistic Concertmate 370 Keyboard Works Great Digital Pulse Code Modulation. Color: Black, Condition: Used. Listed at 54.10 USD. The Realistic Concertmate 370 Keyboard is a compact electronic keyboard with 32 keys, perfect for beginners and small spaces. It utilizes Digital Pulse Code Modulation technology to produce realistic sounds and lower the cost of production, making it a great choice for those looking for a versatile and affordable digital keyboard. The sleek black color adds a stylish touch to this model, which is known for its quality and performance in the world of electronic keyboards. Keyboard is in excellent Preowned condition. Keyboard has been fully tested and works as designed. Operates with plug in power source or 4 AA BATTERIES. Does not come with power supply or batteries. Refer to photos for cosmetic condition.