Specification:

 1. Dimension: 85*40mm

2. Battery: 12V

3. Match with Signal Receiver SK-302

4. 3 different function buttons -- Service, Bill, Refill Drinks

5. A red indicator lighted when signal sent

6. Put on table or wall, with holder stand SK-312A that can put menu or napkin etc on holder

                                                                           SK-312