1、High Interference Resistance: The wireless calling system is highly resistant to interference, with a signal range covering up to 1000 feet in an open area. The presence of wall and other objects may reduce operational distance, with actual distance dependent on the environment. 2、Digital Coding Technology: Featuring digital coding technology, the calling system is compatible with both learning codes and common chip codes. Operating at a stable 433.92MHz frequency, it offers long range wireless reception. 3、Waterproof Construction: The nurse alert call buttons and display screen receivers are crafted from premium ABS and PVC materials, providing IPX4 waterproofing for safety, reliability, and durability. The buttons are pre paired with the receiver for plug and play convenience. 4、Expandable Capacity: The system supports up to 1000 wireless call buttons (shipment includes 20 buttons), making it easy to configure, delete, adjust volume, and clear all numbers. It is a reliable assistant for your business operations. 5、Versatile Installation: The wireless caregiver pager can be easily installed with stickers on each table or wall, carried in pockets, or worn around the neck, allowing quick and convenient access to assistance for customers or patients. The standby time of the buttons can last from 6 to 12 months. 6、Wide Range of Applications: The wireless calling service system can be utilized in restaurants, nursing homes, cafes, supermarkets, hotels, hospital wards, emergency centers, banks, schools, factories, and construction sites, helping enhance the quality of service provided. Item Type: Wireless Calling System Material: ABS, PVC Operating Frequency: 433.92MHz Waterproof Level: IPX4 Operating Temperature: -20℃ to 60℃ SU 620 Display Receiver Parameter: Size: Approx. 210x140x30mm/8.27x5.51x1.18in Receiver Sensitivity: -105dB Decoding: Learning Code SU 1K Transmitter Call Button Parameter: Battery Type: 12V 23A Battery Capacity: Alkaline Battery 60mAh x20 (Included) Transmission Current: 10mA±3mA Standby Current: <1uA Open Transmission Distance: >200m/656ft Key Life: 1,000,000 Presses Single Key: CALL 1 x Display Receiver 1 x Cable 1 x User Manual 20 x Call Buttons 20 x Double Sided Adhesive