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What can a wireless paging system do for you Guest come to the restaurant and makes an order. The waiter gives each guest a pager; Every pager has a number on it and note down the number. When an order is ready, the waiter at the counter will press the number on the transmitter. The corresponding guest gets the wireless signal by his pager vibrating or LED flashing or sounding, then he knows order is ready and goes to the counter to take his food. Keypad call button Frequency 433.92MHz Working voltage DC 5V/6A power adapter Adapter AC 100-240V 50/60Hz Size:11.8 x 5.9 x 1.3in Weight 1.8lb Pager Receiver Frequency 433.92MHz Receive sensitivity -107dBm Decoder Learning code(AM) Standby current 10mA Working current 75mA (vibration) Charging voltage DC 5V Size 3.9x1.9 x 0.4 in Package Includes 20 x Pagers 1 x Antenna 1 x Power adaptor 1 x Keypad transmitter 1 x English manual