Practical & reliable Ideal as an alarm for those who need help quickly, such as the elderly, children, disabled people, pregnant women or sick people , just press the call button to receive attentive, timely care without shouting. It can also be used as a doorbell.Long Range Up to 180 meters range in open area (walls and other objects will reduce the range), and the use of a 16-bit encoding to eliminate interference from other devices allows operation virtually anywhere in your home.More alert options Choice of 45 sounds (36 melody sounds and 9 alarm sounds) and three alert modes (Sound + Light, Sound only, Light only). Sound volume adjustable in 3 levels, max. 110db ideal for the elderly. No power switch is designed to avoid forgetting to turn on, as it might miss an important emergency call (if not in use for a long time, remove the batteries to preserve its lifespan).Practical placementtransmitter The waterproof transmitter can be worn as a pendant or at the patient's bedside. The receiver can be wall-mounted, free-standing on the desk, or carried in the caregiver's pocket.Low battery indication 1, No operation, but the battery indicator light=' device keeps flashing or produces abnormal sound, please replace the battery; 2, The pairing between transmitter and receiver may lose contact after replacing the battery, the items are not defective, just pair them manually to repair them. Receiver powered by 3 AAA batteries (not included); transmitter powered by 1 x button cell battery (included). Specifications: Color: White Power: Battery Instructions d=pairing: 1. Press the ;Signal button; on the receiver until the LED turns on 2. Press the red call button once to pair with the receiver (be sure to remove the protective tab from the receiver). plastic battery by opening the call button with the screwdriver provided) 3. The red light will flash to confirm successful pairing 4. The receiver will automatically exit pairing mode 5. The system is ready to use. Repeat the process if the call button and receiver lose connection Package contains: 1 x Call Button 2 x Receiver< /li>