Feature: 1. Waterproof Call System: The watch and touchscreen bell are IPX7 waterproof, ensuring long lasting use in various environments. 2. Flexible Combination: With 4 channels supporting up to 5 buttons, users can freely customize and arrange the components for versatile applications. 3. Easy Operation: Equipped with RF wireless technology, the wireless call system is user friendly and suitable for use in homes, factories, hospitals, ensuring elderly care and emergency calls. 4. Long Lasting Battery: The rechargeable lithium batteries provide a long standby time with low power consumption, ensuring reliable performance of the pager system. 5. Wide Compatibility: The system is suitable for a range of settings and situations, providing convenience and security for users in need of assistance. Specification: Item Type: Wireless Call System Material: ABS Receiver Parameters: Working Frequency: 433.92MHz Charging Voltage: DC5V Battery Type: Lithium Battery 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 Waterproof Grade: IPX7 Working Temperature: -20℃ to 60℃ Transmitter Parameters: Working Frequency: 433.92MHz Size: Approx. 60 x 60 x 13mm / 2.36 x 2.36 x 0.51in Battery Type: CR2032x2 Battery Capacity: 240mAh (included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: >Approx. 100m / 328.08ft Button: 1 million times Waterproof Grade: IPX4 Working Temperature: -20℃ to 55℃ Single Key: CALL. Package List: 1 x Receiver 1 x Transmitter 1 x Charging Cable 1 x User Manual