This is a Transmitter Bell only. Receiver is not included. Go to SINGCALL storefront to find all.(1-5,1-10,1-20 and so on) Purchase this item with a wireless wrist receiver or fixed host can build a simplest calling system. wireless wirst receiver:search: SINGCALL.Wireless Pager Calling System,Restaurant Paging Systems,Wrist Receiver. Comptablie With Single Call Button And Mulit Buttons Fixed Host: Go to SINGCALL¡¯s storefront to find all the fixed host. Search SINGCALL to find more. There are also many different combinations of wireless receivers and pagers in our store to meet your need. Where to install? Restaurant/Cafe/Fast Food Restaurant/Hotel/Golf Club/Bar/Night Club/Internet Cafe/Game Room/Karaoke/Hospital/Factory/Office/Anywhere needs attention of waiter. Have you ever been in a situation that you are ready to take your order in a restaurant but cannot find the waiter or waitress anywhere? The wireless attendant or server call paging system can solve your problem. Wireless fluid system is widely used in the service area. It includes the button for guests to use and the signal receiver for waiters to use. When the guest is in need, he or she just presses the button near him or her, his or her desk number will be displayed with music or vibration. Call output: 20db UV/m Us Frequency Range: 433MHZ With Pager Quantity: 999PCS Frequency deviation: 0.5 Mhz Specifications: 120*120*196mm Call distance: 1500 M(open distance) Power Supply: Alkaline Battery 12V 33mA