Feature: 1. STABLE AND LONG DISTANCE: Wireless calling system adopts high performance wireless technology, strong anti interference, stable and reliable, applicable to a variety of places, paging effect is obvious. 2. MULTIPLE APPLICATIONS: This wireless calling system is widely used in a variety of scenarios, suitable for home, hotels, bars, restaurants, factories, coffee shops, nursing homes and other various places. 3. STYLISH AND PORTABLE: The receiver display adopts fashionable and modern design, which complements the beauty of the environment. Compact call key, easy to move, call anytime, anywhere. 4. EASY TO USE: Wireless pager system is easy to use, the display shows the time, year, month and day, accurate and convenient, easy to record the call time, improve work efficiency. 5. WATERPROOF: Both display receiver and call keys have IPX4 waterproof rating, high sensitivity receiver, reliable to use. With 30 call keys, it can be easily mounted on the table or wall with stickers, or put it in your pocket. Specification: Item Type: Wireless Calling System Material: ABS SU 620 Display Receiver Specifications: Working Frequency: 433.92MHz Size: Approx. 210 x 140 x 30mm / 8.3 x 5.5 x 1.2in Receiving Sensitivity: 105dB Decoding: Learning Code Waterproof Grade: IPX4 Working Temperature: -20℃ to 60℃ Transmitter Specifications: Working Frequency: 433.92MHz Battery Type: Lithium Battery Battery Model: 2 x CR2032 Single Transmitter Battery Capacity: 240mAh (Included) Transmitting Current: 10mA±3mA Standby Current: Less Than 1uA Open Distance: More Than 200m/656ft Key Life: 1 Million Times Waterproof Grade: IPX4 Working Temperature: -20℃ to 60℃ Single Key: CALL. Package List: 30 x Transmitters 30 x Stickers 1 x User Manual 1 x Display Receiver 1 x Supply Cable Adapter Note: Manual measurement, please allow some errors.