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 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. Package List: 1 x Pager System1 x Power Adapter