1、STABLE SIGNAL TRANSMISSION: Calling system highly anti interference and system signal range covers more than 656.2ft in open area (walls and other objects will be decrease operating distance, practical distance depends). Stable system, long wireless reception distance. 2、IPX4 WATERPROOF BUTTON DESIGN: Wireless calling buttons and ABS shell, sturdy in use, buttons have been paired with high sesitive receiver. Makes calling for service super easy. 3、FUNCTIONAL AND PRACTICAL: The display screen shows date and time accurately for easy recording of call times, improving work efficiency. Compact design allows for easy carrying and convenient movement, enabling calls from anywhere. 4、EASY USE: Wireless calling buttons can be easily installed on each table or wall, also can put it in pocket. So that the customer or the patient can get help quickly and conveniently. 5、WIDELY USED: Wireless paging service system can be applied to restaurant, nursing home, cafes, supermarkets, hotel, hospital wards, emergency center, banks, schools, factories, construction sites, it can help you improve quality of service. Item Type: Wireless Calling System Material: ABS Operating Frequency: 433.92MHz Waterproof Level: IPX4 Operating Temperature: -20°C-60°C SU-620 Display Receiver Parameters Description: Size: Approx. 210x140x30mm / 8.27x5.51x1.18in Receiver Sensitivity: 105dB Decoding: Learning Code Button Transmitter Parameter Description: Battery Type: Lithium Battery Battery Model: 2 x CR2032 Single Transmitter Battery Capacity: 240mAh (Included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: >200m / 656.2ft Button: 1 Million Times Double Button: (CALL) (CANCEL) 10 x Button Transmitter 10 x Sticker 1 x User Manual 1 x Display Receiver 1 x Power Adapter