1.Three Key: Service, Drink, Bill 2. Brown Color 3. Use 12V battery 4. ABS material Specification:1. Dimension: 85*40mm2. Battery: 12V3. Match with Signal Receiver SK-3024. 3 different function buttons -- Service, Bill, Refill Drinks5. A red indicator lighted when signal sent6. Put on table or wall, with holder stand SK-312A that can put menu or napkin etc on holder Three-Key Table Button SK-312