1、 Using special parts for aviation communication to ensure the stability of signal transmission, no worry it will appear messy code. 2、Weatherproof: safe, stable and reliable. Can change the number at any time, strong reusability. 3、Energy-saving: the battery can be used for over a half year. Waterproof base for conveniently change battery or maintenance. 4、It can be used with all receiver, portable BP receiver or watch. Service Numbers can be received at any location at any time. 5、Easy to use: just put it onto table, press the function button when need service, the indicator lights up and sends a signal to the receiver. Widely used in hotels, bars, restaurants, factories, workshops, offices, teahouses, restaurants and other pl Call Button: (CTT20) Features: 1. Using special parts for aviation communication to ensure the stability of signal transmission, no worry it will appear messy code. 2. Weatherproof: safe, stable and reliable. Can change the number at any time, strong reusability. 3. Energy-saving: the battery can be used for over a half year. Waterproof base for conveniently change battery or maintenance. 4. It can be used with all receiver, portable BP receiver or watch. Service Numbers can be received at any location at any time. 5. Easy to use: just put it onto table, press the function button when need service, the indicator lights up and sends a signal to the receiver. Widely used in hotels, bars, restaurants, factories, workshops, offices, tea houses, restaurants and other places of entertainment. Call Button: Specification: Condition:100% Brand New Material: abs Color: As Pictures Shown Battery:1 * 12v battery Calling distance: 300m (open area) Frequency:433.92 MHz / 315 MHz Call Button Size: approx.60*60*32mm/2.4*2.4*1.3in Wrist Pager:(CTW05) Features: 1. It has vibration, bell ringing, sleep function(when customers do not need to receive the call, can choose to go into the sleep state, in which the clock and alarm function still work, and almost no power consumption). 2. Adopted 3.7v polymer lithium battery, with normal standby time of about 20 days. 3. Can receive the caller signal alone, without the need for base station service. Built-in antenna. 5. Display a group of four digits. The machine can display a group of four digits or letters and store 10 Numbers. Press M key to flip the page to browse the call number, press enter key to confirm the call and delete it; 6. There are ring and vibration two prompt modes:  customers can choose different prompt modes according to their actual needs, and switch between ring and vibration at will, which is simple and convenient. 7. With 500 call extension, any call extension can set letters and numbers combination, any bit can be set to 0~9 and other 10 numbers, ABCDEFGHIJLMNOPQRSTUWY and other letters and (-). 8. Each call can be set to 2-bit, 3-bit or 4-bit display, such as 01, ABC, or A-08, etc. Wrist Pager: Specification: Condition:100% Brand New Material: abs Engineering plastics Model: CTW05 Color: As Pictures Shown Applicable for: Cafe, teahouse, Internet cafe and other service personnel receive customer call receiving end. Transmission distance: The theoretical distance of the open area is 1500 meters, while the actual distance is generally 100-150 meters indoors according to the site test. Compatibility: Compatible with any one of the callers. Working Frequency: 433.92 MHZ; 315 MHZ Power supply: Fit 5V=1A charger, built-in 3.7v polymer lithium battery. Wrist Pager Size: approx.50*15*40mm/2*0.6*1.6in(Not included Watch Strap) Wrist Pager Size: approx.273*22mm/10.8*0.9in(included Watch Strap length) Package list: 1 * Wrist Pagers 10 * Call Buttons 1 * USB Cable