Wireless Waiter Calling System: The wireless waiting call system allows for efficient and timely service without the need for physical buttons. Made of high-quality materials, sturdy and durable. Easy to use, the call button is designed to be user-friendly and can be used easily by anyone. Compact design Small size, light weight and round shape make the pager comfortable to hold and easy to carry. 4 function keys, very convenient for guests to use, especially for restaurants.<br><br>Modulation Mode:ASK (AM) RF Frequency:433MHz Working Chip:Learning Code Power Supply:Button Cell Colour:Black Material:Plastic<br><br>Package Contents: 10 * Call Button<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.