Feature: 1. High Sensitivity and Stable Frequency: The wireless calling system includes 4 watch receivers and 1 transmitter, operating at a high sensitivity level with stable working frequency and distance, offering convenience and practicality. 2. RF Wireless Technology: Utilizing RF wireless technology, the nurse call system provides various alert modes including flashing lights and vibration, flashing lights and buzzer, as well as flashing lights, vibration, and buzzer. 3. Stylish and Water Resistant: The watch receivers feature a fashionable design and IPX7 water resistant rating, making them suitable for a wide range of environments with easy operating. 4. Removable Rechargeable Battery: The transmitter features a detachable rechargeable battery with long standby time and built in charging circuit guard, ensuring reliable performance. 5. Wide Application in Various Settings: Ideal for use in homes, hospitals, restaurants, factories, and more, the wireless calling system delivers convenient call services for improved efficiency. Specification: Item Type: Wireless Calling System Material: ABS Watch Receiver Specifications: Working Frequency: 433.92MHz Charging Voltage: DC 5V Battery Type: Lithium Battery Single Watch Receiver Battery Capacity: 300mAh (Included) Working Current: 100±20mA (Vibration and Buzzer Mode) 75±10mA (Vibration Mode) Standby Current: 10±5mA Receiving Sensitivity: -107±2dBm Decoding: Learning Code Water Resistant Level: IPX7 Working Temperature: -20℃ to 60℃ SU U4 Transmitter Specifications: Working Frequency: 433.92MHz Size: Approx. 95x40x15mm/3.74x1.57x0.59in Battery Type: 23A 12V Battery x1 Battery Capacity: 60mAh (Included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: >1000m Key: 1 Million Times Water Resistant Level: IPX4 Working Temperature: -20℃ to 55℃ Four Key: A, B, C, D. Package List: 1 x User Manual 4 x Charging Cable 4 x Watch Receiver 1 x Transmitter