1、STABLE SIGNAL TRANSMISSION: Calling system highly anti interference and system signal range covers 1000 feet in open area (walls and other objects will be decrease operating distance, practical distance depends). Digital coding technology, compatible with both learning code and common code chip, stable system, long wireless reception distance. 2、FUNCTIONAL AND PRACTICAL: Wireless pager most support 1000pcs wireless call button, pager easy to configure button, remove button, adjust volume and remove all number, it is definitely a good helper for your business. 3、EASY USE AND LONG STANDBY TIME: Wireless calling buttons can be easily installed on each table or wall with sticker, also can put it in pocket or hanging on the neck. So that the customer or the patient can get help quickly and conveniently, call button standby time up to 6‑12 months. 4、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. 5、WATERPROOF BUTTON DESIGN: Wireless calling buttons and ABS shell, sturdy in use, buttons have been paired with receiver, plug and play. Makes calling for service super easy. Item Type: Wireless Calling System Material: ABS, PVC Screen Receiver Parameter: Frequency: 433.92MHz Receiver Size: Approx. 210x140x30mm / 8.27x5.51x1.18in Receiver Sensitivity: -105dB Decoding: Learning Code Waterproof Level: IPX4 Working Temperature: -20°C-60°C Model SU-1K Button Transmitter Parameter: Transmitter Frequency: 433.92MHz Battery Model: 12V23A Battery Capacity: 20 x Alkaline Battery 60mAh (Inclusive) Transmitting Current: 10mA±3mA Standby Current: <1uA Transmission Distance: Approx. >200m / 656ft Button Life: 1000000 Times Waterproof Level: IPX4 Working Temperature: -20°C-60°C Single Key: Call 1 x Wireless Calling System 1 x Power Cord 1 x User Manual 20 x Buttons 20 x Double Sided Adhesive