This home calling system has the feature of audible and visual. 4 Level volume to adjust, highest volume is up to 110 dB. This unit flashes when someone presses the call button, your family can see the LED lights is on, flashing, and the receiver chimes.Additional receivers and buttons can be programming to the system. Programming steps are super easy. As your meet, set up your own caregiver pager system.This nurse alert system comes with 1 receiver and 1 call button, and extra battery. No monthly fee required. 500 ft working range makes it works well in your house.This call button can be wear or fixed on wall, which is IP 55 waterproof grade, possible waterproof to soap, coffee, milk, juice and other liquid splash.It is Caregiver's Gospel. Suitable for elderly, patient, disable, Alzheimer, hearing impairment etc. They're no need to yell to get help, just press call button to alert their caregiver or family.Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on.Material: ABScolour: red+whiteVoltage: AC100-240VPackage Contents:1 x receiver1 x call buttonOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.