Check the listing for details. Tivdio Restaurant 18 Coaster Pager Wireless Paging Queuing Calling System Cafe. Color: Black, Condition: Used, Made in China. Listed at 75.00 USD. *******NOTE. ONLY 18 PAGERS INCLUDED. *****This wireless calling system is perfect for use in restaurants or other busy establishments. With a range of 1000m or 3280ft, customers can easily call for attention from anywhere in the queue. The system includes 18 wireless pagers, each with a built-in 360mAh rechargeable lithium battery, and a charging voltage of DC 5V. The pagers are made of durable ABS material and have a standby current of 10mA. The system also features three prompt modes and a person locator, making it easy to keep track of multiple pagers. The RETEKESS T111 model is designed for use in the HF band with a frequency of 433.92MHz and a receive sensitivity of -107dBm.