The remote wireless lane alarm can detect from 7 meters to 120 degrees. The radio frequency is 433 MHz, so the communication range between the sensor and the receiver can reach 200 meters. It allows you to place it far away from the receiver to warn your family, unwanted guests or lawyers, or anyone visiting your home or business. The entry alarm rings the office/store and informs you when customers arrive so that you will not miss any visitors. Available in 4 volume levels (including mute mode), the simple and harmonious sound of the doorbell is not unpleasant 3 Alarm Options and 38 Buzzers: The wireless pathway alarm has 3 alarm options (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] Wireless pathway alarm is weatherproof outdoor. IP52 waterproof material is adopted to deepen the waterproof groove and lift the waterproof cover. Professionally tested to withstand IP65 waterproof and