<p>1\u3001STABLE SIGNAL AND ANTI INTERFERENCE: Stable signal with 1000m long distance transmission; Provides enhanced anti\u2011interference function for the patented pairing technology. 2\u3001RECHARGEABLE AND PORTABLE: Equipped with a 500mA lithium battery and a low battery indicator, the CALL button can be fully charged in about 3 hours, with a charge time of up to 30 days. The receiver can be fully charged in approximately 3 hours and remain charged for up to 7 days. 3\u3001CALLER ID AND EASY TO EXPAND: The receiver has a caller ID function that tells you who is seeking help; the system can be expanded for more receivers and more call buttons. 4\u3001VOLUME AND TONALITY ADJUSTABLE: There are 4 volume levels and 12 tonality available; in addition, the CALL button has a night light for better use. 5\u3001USE ADVICE: If you encounter any product installation test abnormality, please do troubleshooting first. Equipped with a lanyard and belt clip for easy carrying </p> <p> Item Type:\u00A0Wireless\u00A0Caregiver\u00A0Pager\u00A0Call\u00A0Button </p> <p> Material: ABS </p> <p> Transmitter Built In Battery: Lithium Battery 500mah </p> <p> Receiver Built In Battery: Lithium 500mah </p> <p> Frequency Range: 433MHz </p> <p> Receiving Sensitivity: -120dBm </p> <p> Operating Temperature: -25~65 Degrees Celsius </p> <p> Power Failure Memory Function: Support </p> <p> Number of Connections: 1 To 8 </p> <p> 1 x Transmitter </p> <p> 1 x Receiver </p> <p> 1 x Charging Cable </p> <p> 2 x Shoulder Strap</p>