Check the listing for details. Retekess T112 Wireless Paging Queuing Calling System Restaurant 30 Coaster Bar. Color: Black, Condition: New. Listed at 299.99 USD. Features: 1.Each pager built-in rechargeable lithium battery, low battery indicator, charging indicator 2.Learning code registration mode, can easily add up to 999 pagers. (NO.1-20 pagers have been paired and can be used out of box with fully charged. ) 3.3 Prompt modes: Vibration & Buzzer & Vibration+Buzzer (each mode is accompanied by the LED flashing) 4.20 batteries charging slots 5.Built-in external antenna, working distance is about 400m(1313ft) in the open area (Note: the range is affected by surroundings) 6. Allow two or more keypad transmitters in different areas to call the same pager. Package Includes 1 x Keypad transmitter 30 x Pagers 1 x Power adaptor 1 x Antenna 1 x English manual.