Feature: 1. WIRELESS DESIGN: Smart call system adopts wireless RF technology, the system is stable and the wireless receiving distance is long. 2. ADJUSTABLE VOLUME: Wireless caregiver pager adopts adjustable volume design, supporting 4 levels of CNC volume adjustment, suitable for a variety of situations. 3. REMINDER MODES: SOS call button has 31 kinds of ringtones to choose from, and has LED flashing light to remind, no string ringing and no false ringing. 4. STABLE PERFORMANCE: Call button system adopts advanced microprocessor chip, stable and reliable performance. With 1 receiver 1 call button, support multiple pager settings. 5. APPLICABLE PLACES: Wireless call button is widely used in various places such as home, villa, nursing the elderly, patients, pregnant women, hospitals, health clubs, and offices. 6. EASY TO USE: Alert button is easy to use, plug and play, just press the button to get help, suitable for elderly, seniors, patients and disabled people. Specification: Item Type: Smart Call System Material: ABS Receiver Parameters: Operating Frequency: 433.92MHz Receiving Sensitivity: ‑107±2dBm Decoding: Learning Code Waterproof Rating: IPX4 Operating Temperature: ‑20℃ to 60℃ Transmitter Parameters: Operating Frequency: 433.92MHz Battery Type: Alkaline Battery Battery Type: 12V23A Battery Capacity: 60mAh (included) Emission Current: 10±3mA Standby Current: <1uA Open Range: >200m Push Button: 1 Million Times Waterproof Rating: IPX7 Operating Temperature: ‑20℃ to 55℃ Single Key: Call (CALL). Package List: 1 x Transmitter1 x Receiver1 x Instruction Manual