The remote wireless tracking alarm can detect 7 meters at 120 degrees. The RF frequency is 433MHz, 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, uninvited guests, lawyers or anyone visiting your home or business. The entry alarm will sound in the office/store and alert you when customers arrive so that you will not miss any visitors. 4 volume levels are optional (including mute), and the simple and harmonious sound of the doorbell is not unpleasant. 3 alarm options and 38 buzzers: The wireless siren has 3 alarm options (audio buzzer/flash/buzzer and LED), 38 buzzers and 3 volume levels (25dB to 80dB) are available to meet your needs. [IP65 waterproof] Outdoor weatherproof wireless channel alarm. Use IP65 waterproof material, deepen the waterproof groove and lift the waterproof cover. Professionally tested to withstand IP65 waterproof and operating temperature from -20℃ to