EXTREMELY SENSITIVE! The device is extremely sensitive to changes in lighting conditions. Incorrect installation will cause incorrect performance of the device. Read the description carefully and do not hesitate to contact us if you have any questions. READ DESCRIPTION FOR CLARIFICATION! Simplify visitor tracking at your entrance/exit! Just insert batteries, install the wireless door traffic counter, and effortlessly monitor visitor count with utmost precision and ease of use. Long Battery Life: Powered by four 1.5v alkaline batteries, the Smart Counter lasts over a year on a single set, ensuring uninterrupted operation without frequent maintenance Versatile Usage: Ideal for retail stores, museums, libraries, and any indoor space requiring precise visitor tracking to optimize operations and enhance customer experience Easy Installation: Install effortlessly with self-tapping fasteners or adhesive tape, making setup quick and hassle-free for any retail environment Can be used as Retail Security Checkpoints counter. If numbers on display are getting higher during the off-hours, that could be a sign of a security breach