The wireless tracking alarm can detect a distance of 7 meters at 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 alert your family, unwanted guests, lawyers or anyone who visits your home or business. The entry alarm rings in your office/shop and notifies you of the arrival of customers, so you will not miss anyone. Available in 4 volume levels (including silent mode), the simple and harmonious sound of the doorbell is not unpleasant. 4 Alarm Options & 38 Buzzers: The wireless lane alarm has 4 alarm options (buzzer / flash / BUZZER & LED), 38 buzzers and 3 volume levels (25dB to 80dB) for you to choose from to meet your needs. [IP65 Waterproof] Outdoor weatherproof wireless lane alarm. IP65 waterproof material is adopted to deepen the waterproof groove and raise the waterproof cover. Professionally tested to withstand IP65 waterproofing and