SanJie SANJIE Wireless Door Open Alarm Sensor Chime, 600FT Operating Range 55 Ringtones 5 Volume Level with LED Indicator,Door Alarm for Home Store Office Security When Opens,3 UK Plug in Receivers 3 Sensors

Newly upgraded function: this upgraded door sensor alarm are more durable and stable, each door sensor can be used up to 100,000 times, the door alarm sensor have ON/OFF switch, you can freely control the use time, the coverage distance reaches 800ft/240M, which can satisfy most of the family's needs.

Door chimes when door opens:This wireless door alarm sensor can be a good reminder for you if you have toddler who try to sneak out of their bed room or help alert you the elderly with dementia who is trying to get out of the house.comes with a 90-day free return and a 365-day exchange service

Wireless door alarm for business: This door alarm can be used as a doorbell chime for your retail shop for your commercial to remind you when customers walks into your store, you will never miss any customers(visitors)

Easy to InstallThe door alarm and receiver are paired before shippment,Just plug the receiver into standard outlet, tear the double-side adhesive tape of the door sensor and stick them to any door or window,make sure the gap between the door sensor and magnet less than 0.6inch.

55 Ringtones with Mute to 110dB: The door alarms for business/home has 55 chimes with 5 adjustable volumes. With LED indicators and memory function: it will keep the previous set tune after re-plugging.