Feature: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 09.3. 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 SU668 SU669 SU680 SU668S SU669S 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 SystemMaterial: ABSFrequency: 433MHzStandby Current: 60mA 10mATransmission Current: 100 mA.Package List:1 x Pager System1 x Power Adapter