1、With a 7V polymer lithium battery, the normal standby time is about 20 days. 2、The pager signal can be received separately without the need for base station services. Built-in antenna. 3、Display a set of four digits, the unit can display a set of four digits or letters, and store 10 numbers, press the M key to page through the call number, press the Enter key to confirm the call and delete. 4、There are two ways to remind you of ringing and vibrating: customers can choose different prompting methods according to actual needs, ringing and vibration can be switched at will, simple and convenient. 5、Totally waterproof structure, suitable for use in restaurants and other occasions. Feature(CTW05 Receiver): With a 3.7V polymer lithium battery, the normal standby time is about 20 days. The pager signal can be received separately without the need for base station services. Built-in antenna. Display a set of four digits, the unit can display a set of four digits or letters, and store 10 numbers, press the M key to page through the call number, press the Enter key to confirm the call and delete. There are two ways to remind you of ringing and vibrating: customers can choose different prompting methods according to actual needs, ringing and vibration can be switched at will, simple and convenient. It can carry 500 call extensions. Any call extension can set letters and numbers combination. Any digit can be set to 10 digits such as 0~9 and letters such as ABCDEFGHIJLMNOPQRSTUWY. Each call can be set to 2 digits, 3 digits or 4 digits, such as 01, ABC, or A- 08. With an alarm clock function. With sleep function: This product has a sleep function. When the customer does not need to receive a call, he can choose to enter the sleep state. In the sleep state, the clock and alarm functions still work, and almost no power is consumed. Specification(CTW05 Receiver): Model CTW05 Plug type US Plug; EU Plug; UK Plug(Optional) Voltage 110-240V Application Service personnel such as cafes, tea houses, and Internet cafes receive the receiving end of customer calls. Transmission distance The theoretical distance of the open area is 1500 meters, and the actual distance is 100-150 meters indoors according to the location test. Compatibility Compatible with any caller for Catel Size 50*15*40mm（no include strap）273*22mm（include dial） Frequency 433.92MHZ; 315MHZ Power Suitable 5V/1A charge; Built-in 3.7V Lithium polymer battery Color Black Material ABS engineering plastic Feature(CTT23 Pager): Stylish and beautiful, simple, silicone button, waterproof and feel good The SAW DEVICE signal channel is used to ensure the stability of its signal transmission. Totally waterproof structure, suitable for use in restaurants and other occasions. Built-in antenna Specification(CTT23 Pager) : Radiation distance: 500 meters (open area) Battery: 12V/23mA battery Frequency: 433MHz Working current: 17mA Size: 60 * 60 * 20mm Suitable for: hotels, bars, internet cafes, restaurants, etc. Package list: 1 * Receiver 10 * Pager 1 * Data line 1 * Plug (Include battery) Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.