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 SystemMaterial: ABSWatch Receiver Specifications:Working Frequency: 433.92MHzCharging Voltage: DC 5VBattery Type: Lithium BatterySingle Watch Receiver Battery Capacity: 300mAh (Included)Working Current: 10020mA (Vibration and Buzzer Mode)7510mA (Vibration Mode)Standby Current: 105mAReceiving Sensitivity: -1072dBmDecoding: Learning CodeWater Resistant Level: IPX7Working Temperature: -20 to 60SU U4 Transmitter Specifications:Working Frequency: 433.92MHzSize: Approx. 95x40x15mm/3.74x1.57x0.59inBattery Type: 23A 12V Battery x1Battery Capacity: 60mAh (Included)Transmitting Current: 10mA3mAStandby Current: <1uAOpen Distance: >1000mKey: 1 Million TimesWater Resistant Level: IPX4Working Temperature: -20 to 55Four Key: A, B, C, D.Package List:1 x User Manual4 x Charging Cable4 x Watch Receiver1 x Transmitter