Usage Tips:Maximum range of 100 m between the infrared detector and the receiver (without obstacle). 3 levels of volume adjustment: high, medium and low. 2 alarm modes: buzzer + LED or LED only. You have a total of 38 different ring tones to welcome your guests. The range of the detector is 3 to 7 meters in the vertical direction and 3 to 5 meters in the horizontal direction. Receiver dimensions: 76 x 80 x 33mm. Detector dimensions: 80 x 59 x 45mm. Perfect alarm system for windows, doors, garage doors or other openings, whether in a private residence or in a shop. Detector power supply: 3 AAA batteries or 5V power supply with USB connectivity (not included). Receiver power supply: 110-240 V DC power supply. Specifications: Range between detector and receiver: 100 m (unobstructed). Detector range: 3 to 7 meters in the vertical direction and 3 to 5 meters in the horizontal direction. Dimensions of the detector: 80 x 59 x 45mm. Receiver dimensions: 76 x 80 x 33 mm. Detector power supply: 3 AAA batteries or 5V power supply with USB connectivity (not included). Receiver power supply: 110-240 V DC power supply unit. Scope of supply: 1 detector. 1 receiver.</p > 1 set of mounting accessories. 1 set of user manual Note: The data is all measured manually, please allow 1 to 1 error. 3cm, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store