Restaurant Pager System 1 Host 15 Pagers Stackable Charging 300m Coaster Paging System with 3 Vibration Modes 100‑240V                Feature:   1. 300 Meters Transmission Distance: 300 meters transmission distance, 3 vibration modes (vibration, buzzer and flashing light), 433.92MHZ transmission frequency.     2. Waterproof: Safe and deep waterproof design, no longer have to worry about overturning the soup, touch screen keyboard to transmit the host, waterproof and oilproof, stylish and beautiful.     3. Touch Keyboard: Touch keyboard integrated keyboard base, intelligent charging system prolongs service life, stacking charging saves space, and standby time is about 20 hours.     4. UHF Technology: UHF ultra high frequency technology, unique system ID, eliminating interference, multiple systems can work in the same environment.     5. Wireless Transmission: One host controls 15 sub machines, wireless transmission, can connect up to 998 sub machines, widely used in fast food restaurants, food courts, pizzerias, churches and auto shops or other places where there are many customers waiting to be served.             Specification:               Item Type: Restaurant Pager System 15  Material: Plastic, Electronics  Model: 9303  Input Power: DC12V/2A  Transmission Frequency: 433.92MHZ  Transmit Power: 240mW  Transmission Distance: Approx. 300meter / 9.8ft  Number of Game Subs: 998  Number of Charging Handsets: 15  Standby Time: More Than 20 Hours  Tips: Vibration, Buzzer, Flashing Light  Modulation Method: AM OOK  Keys: (Touch) Number Keys, Call Key, Delete Key  Battery Type: Built in 200mAh Lithium Battery  Applicable Voltage: 100-240V                       Package List:       1 x Main Unit       15 x Sub Machine       1 x Power       1 x User Manual                 How to use:plug and play