Product Highlights

• ♥【Plugin Receiver & Battery-powered Transmitter】-The wireless plug in receiver operating voltage is 110-260V, it does not need any batteries, save your trouble and money. The transmitter is battery-powered (battery included), the sensor and magnet can be fixed with double-sided tape (included). This wireless door sensor is suitable for anti-theft, retail, visitor, nursing care, offices, factories, warehouses, home care and etc.
• ♥【55 Ring Tones & 5 Volume (Plus Mute) & LED Flash for Hearing Loss】-55 unique ringtones and 5 volume levels from 0% (mute) to 100%. Koostone door sensor can meet all your needs. With the built-in LED indicator, the door open alarm receiver provides additional assistance to the hearing impaired. NOTE:The fixing distance of sensor and magnet should be LESS than 0.3 inches/0.8 cm, the closer the better, try to reset them closer if the receiver doesn't work.
• ♥【Easy Pairing】▲Step 1: Plug the receiver in socket. ▲Step 2: Press the volume/backward/forward to select your favorite ringtone/volume. ▲Step 3: Press the "Volume" for about 5 seconds until it makes 1 "Ding". ▲Step 4: Separate the sensor and magnet, the receiver will make 2 "Dings" with LED light flashing, pairing completed. (Note: Please read the manual before pairing).
• ♥【Transmitters or Receivers are Expandable】When the door/window opens,the sensor will be triggered to send out a signal,the receiver will receive the signal and alert. Note: Koostone door sensor alarm for home are expandable, which means that one receiver can be paired with multiple transmitters,one transmitter can also be paired with multiple receivers. Please choose the proper Koostone door chime combination base on your need.
• ♥【Easy Installation & 490 Feet Long Operating Range & Quality Guarantee】Step 1: Choose a favorite ringtone and pair the sensor and receiver. Step 2: Fix the magnetic sensor on your door/window by double-sided tapes, all done...Koostone wireless door chime provide 24 hours email reply. Complete satisfaction guaranteed!