The remote wireless track alarm can detect from 7 meters to 120 degrees. The radio frequency frequency is 433 MHz, so the communication range between sensor and receiver can reach 200 meters. It allows you to place it away from the receiver to notify your family, unwanted guests or lawyers, or anyone visiting your home or business. The entrance alarm rings the office / store and notifies you when customers arrive so that you don't miss any visitors. Available in 4 volume levels (including mute), the simple and harmonious sound of the doorbell is not unpleasant 3 Alarm Options and 38 buzzers: the wireless pathway alarm has 3 Options alarm (audio buzzer / flashing / BUZZER and LED), 38 buzzers and 3 volume levels (25 dB to 80 DB) to choose from to meet your needs. [ip65 waterproof] outdoor weatherproof wireless pathway alarm. IP52 waterproof material is adopted to deepen the waterproof groove and lift the waterproof cover. Professionally tested to withstand IP65 waterproofing and operating temperatures of -20 to 60 Ideal for front doors, window frames, driveways, hiking trails and any place in your home where you need a reminder to move. For business owners who work in the back or are not in sight, it is also good to alert customers entering their stores.