Description: The main device has 16, 20, and 24 ports and can charge all receivers simultaneously. This device uses high signal technology, even through walls. The main device's keyboard is touch-sensitive. Water and oil resistant. There are two alert modes: 1. Vibration 2. Flash light, and you can set the duration from 1 second to 999 seconds. Wireless calling device for restaurants and cafes. This device is used for restaurants, cafes, and food trucks when the order is ready. The customer is given a pager when they receive the bill, and when their order is finished, they are called using the device - with sound and light system. Device Features: Stable frequencies are not affected by other radio signals or mobile networks. The device comes with 20, 24, or 16 pagers and a charging base. Easy-to-use calling keypad. Elegant design and a beautiful base. Built-in rechargeable battery, can be used for 72 hours in standby mode and 36 hours of use. 16 pagers 20 pagers 24 pagers