Features: 1.1000 Meters Working Distance: Pager system external antenna, open area working distance is about 1000 meters (3280 feet). 2.999 Different Codes: The Pager system sends 999 different codes by a combination of numbers 0?9. 3.ABS Material: Restaurant pager is made of high quality sturdy ABS material, which is wear resistant and durable, and can be used for a long time. 4.Scope of Application: Wireless calling system is suitable for replacement of SU?668 SU?669 SU?680 SU?668S SU?669S food fetcher numeric keypad transmitter. 5.Applicable Scenarios: Wireless calling system application places restaurants, tea houses, banks, coffee shops, milk tea shops, factories, hospitals, service halls and other calling and queuing places. specification:Item Type: Pager System Material: ABS Frequency: 433MHz Standby Current: 60mA 10mA Transmission Current: 100 mA Voltage: 100-240V PackageList: 1 xPagerSystem 1 x Power Adapter