NineLeaf Wireless Welcome Doorbell, Wireless Alarm, Motion Sensor Alarm, Multiple Sounds Available, 280 Meters Transmission, 40mm Loud Speaker，3 receivers，1 Sensor - NineLeafTech, NL-AMA01-SF20R-PRO-1PK+ALARM-20R-PRO-2PK

• 【Simple Installation】For the receiver, no wiring, no installation trouble, self-adhesive mounting, the detector is mounted on the wall. Before use, please read the instructions carefully and load batteries, adjust the angle of the sensor to avoid false alarms. Note: This unit is for indoor use, please don't install it in direct sunlight or rain forest. 【Rich Ringtone Choice】Split sensor doorbell, the receiver has 17 ringtones to choose from with bright 4-color LED lights. There are also 4 retail store welcome ringtones. You can choose freely according to your personal preference. 【Vibration Alert】New Silent Mode with Strong Vibration Alert for quiet environment or night time use, providing a more private and distraction-free experience. 【Power Saving Design】NineLeaf Wireless Welcome Doorbell adopts the fourth generation of power saving technology to minimize the hassle of frequent battery replacement. It can be powered by batteries or micro USB, and can be recharged at any time, making it more convenient and environmentally friendly to use. 【Applicable Range】 The working range between receiver and transmitter is up to 918 feet (280 meters). Suitable for stores, shopping malls, offices, factories, hotels, upscale clubs, homes and villas, and many other places. Self-adhesive tape for installation and comes with a one-year warranty., Manufacturer: NineLeafTech