Product Description Watch Clock Restaurant Wireless Calling Paging System Package included: 1 x Watch Pager Receiver 10 x Table Call Button Wireless Calling System is widely used in service area. It consist of table service call button for guest use and signal receiver for waiter or waitress use. When the guest need any service, they just press the button on the table, this desk number will show on the RECEIVER with alert music or sound. So the waiter could offer service very timely. Specification of wrist watch K-300PLUS: 1. Can work with 500pcs multi-key transmitter in max 2. Can show 3 group call number in one time 3. Show 4-digit number from 0001-9999 and first alphabet can be A-Z 4. Can indicate different service type via words or alphabet. ( call; bill; drink; dessert; help etc and A-Z) 5. Can record when the call come in and count the call times of each number 6. Can track the history calling info by up and down 7. Show current time when stand-by 8. 3 reminder ways: sound prompt and vibration or both 9. Battery is rechargeable: 3.7V Lithuim battery 10.Dimension: 50*51*16mm 11.Color: Silver, blue, green, red, black 12. Output: DC5V--1A Specification of call bell button K-O4: 4 key: Call; Bill; Drinkl; Cancel Signal Distance: 100m in open area Material: PC and waterproof silicone Dimension: 60*60*22mm 100% waterproof With a 12V 23A battery Detailed Photos