Retekess TH103P emergency call bell is ideal for the elderly; children; disabled; pregnant women or patients ^^ Quick emergency call; just press the call button or pull the call cord about 75 cm long; SOS alarm flashes and beeps; easy and convenient operation ^^ Emergency call receiver with three LED lights; LED lights light up and alarm sounds when receiving a signal ^^ The coverage range of TH103P elderly care call bell is 200m/656ft meters in an open area; caregiver call bell can be used on upper and lower floors of the house; walls or other objects may reduce the coverage ^^ Expandable to multiple receivers and call bells; one call bell can be paired with an unlimited number of receivers; one receiver can be paired with 20 call bells