Description:Features: Welcome guestWhen the doorbell is used to welcome guests, the sensor is installed on the top of the door or on the wall, and the detection angle can be adjusted freely. When a guest enters the range, the sensor rings to welcome the guest, reminding that there is a guest at the door of the house. Detection rangeDetection range:2-7m. When customers enter the sensing range, the sensor will send out a welcome prompt to create a good service environment for the store and remind the staff at the same time. Emergency reminderWhen the doorbell is used as an emergency reminder. The sensor is installed facing the balcony, doors, windows, stairs, etc., and the height is installed in an appropriate range and the detection angle of the device can be adjusted freely. When someone enters the range, the sensor will sound an emergency reminder. Applicable scenarioApplicable scenarios. It is widely used in shops, supermarkets, office buildings, convenience stores, hotels, banks and homes, etc., bringing convenience, joy and security to you, your family and friends. All-round 360All-round 360, free adjustment, with universal bracket, up and down 360 rotation, left and right 360 rotation, arbitrary angle adjustment, suitable for different installation environments.Dual power supply system, can be powered by external power supply, battery powered, easy to use, simple and diverse choices. Note: battery/power supply needs to be prepared. Dual power supply Two installation methods: A. Glue/attach the double-sided tape to the bottom of the universal bracket. Then attach the universal bracket to the wall. Adhesive on the back of the door/door frame. B. Screw fixing/Use mounting screws to fix the universal bracket to the wall/door frame. Specifications: Material: ABS Color: white Detection range:2-7m Size(about): 68x95mm/2.68x3.4inch(WxH) Powered by: Battery power supply: 3pcs x AAA batteries for power supply (battery self-contained) or 5V cable (self-provided) plug and play, no battery required Package Included: 1pc x doorbell 1pc x double side stivker 2pcs x screws Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.