Description: 【Easy to Install】Door Chime for Business When Entering, easy and convenient to install, no professional is required. The recommended installation height is 1.5m-2.5m. 【Premium Material】Doorbell Chime is made of ABS material, reliable quality, sturdy and can be used for a long time. 【Features】Store Door Entry Bell has a detection range of 4-6m. Volume: 4 levels adjustable (volume cannot be adjusted in alarm mode). 3 modes, namely voice (4 types), alarm, music (17 songs). Adjustable direction (with bracket). 【Intelligent Sensing】Store welcome bell uses infrared sensing technology, which can automatically and accurately sense customers entering and exiting, and play voice prompts. 【Wide Application】Commercial Door Entry Alarm is suitable for offices, shops, restaurants, homes and other occasions, suitable for door frames, walls and other locations. Specification: Material: ABS Ambient temperature/humidity: -10-50 degrees Detection angle: 110 degrees horizontal, 15 degrees vertical Alarm volume: built in speaker, alarm volume 75-95 decibels Requires 3x AAA batteries (not included) Size Chart: 8.5cmx4.5cmx9cm/3.35inchx1.77inchx3.54inch Package Includes: 1x Store welcome bell Note: Please allow slightly errors 1-2cm differences due to manual measurement.