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Long-range Wireless The longest distance the signal from the motion sensor can be transmitted to the receiver is 300 feet and the motion detector infrared detection distance is about 20 feet. Convenient for you to install in various locations of your house to give your family security. Wide Use This motion detection alarm system can be used as a doorbell garage alarm intruder warning burglar warning wildlife warning child elderly care alarm etc. It can be installed at the front door window frame driveway walkway and anywhere in your home where you want an early warning. 3 volume and 38 bells The alarm have two alarm signals: LED light and bell. There are 38 ringtones to choose from and three levels of volume medium high and low if you want quiet you can choose the silent mode only LED warning no sudden sound to scare your family. Avoid false alarms – Do not place the detector where the wind will make it active. For optimal performance try to keep the detection range of the motion detector free of obstructions such as trees. This motion detector is not waterproof so please avoid the rain for installation. You can get 4pcs motion detector need AAA batterynot included 2pcs alarm 4 sets of mounting screws. Professional after-sales guarantee: from the day you receive the motion sensor alarm you will enjoy our professional return guarantee. BESTOONE Motion Sensor Alarm Product introduction 1. The receiver working power: 110-240V 2. the transmitter working power: 4.5V 3 AAA batteries not included 3. the receiver buttons: 1 music: 38 ringtones 2 volume: thigh medium low 3 mute 4. working distance: up to 300 feet 5 .the transmitter sensing distance: 0-20 feet Package includes 2 Receiver 4 detector 4 installation accessories 1 Instruction manual Precautions 1. the sensor should be installed as far as possible to avoid directly facing the larger airflow and near the location of the heat source. such as cold air outlet exhaust fan electric stove or near the heating etc. Do not install the sensor directly in the sun and rain and do not close to metal objects. 2. the sensor should be installed at a height of about 2 meters; sensor lateral detection than a straight line human body directly facing the sensor detection sensitive should generally be installed in the side or top of the entrance door and through the installation bracket to adjust the induction to a suitable location in order to achieve better induction effect 3. between the sensor and the receiver should be as far as possible to reduce obstructions and other wireless signal interference generally in the obstruction of a wall the distance between the sensor and the receiver should be controlled at about 20 meters. 4. If the doorbell has a short receiving distance or malfunctions please check the detector battery or replace it. 5. if the use of high ambient temperature more than 30 degrees the detector induction distance will be shortened which is a normal phenomenon.