eWeLink Smoke Detector Sensor Wireless 433MHz Fire Security Protection Alarm Sensor Work with Sonoff RF Bridge APP Control Smart Home For Home Kitchen/Store/Hotel/Factory White Please Note: Because of shipping limitation, battery( DC9V 6F22 ) for smoke detector not included.Features:*Support three alarms: independent sound & light flash alarm, wireless 433 transmission network alarm.*360 degrees smoke detection and alarm, no dead angle, reliable. Built-in 90 dB sound and light alarm reminder, effectively prompting people to evacuate.*Adopt high-performance photoelectric two-way scattering patented technology of two-receiving & one-transmitting and high-sensitivity sensing, stable, reliable, safe and accurate.*This smoke sensor can work alone to realize independent alarm at home. To achieve remote control on the phone, smoke detector needs to work with Sonoff RF bridge( 433Mhz, EV1527) host.*Ultra-low-power microcontroller + photoelectric principle technology, long standby life battery use for 3 years.*Low Voltage Alarm: When the battery voltage is lower than 6.8V, a warning sound is issued to remind the user to change the battery.*Full snap-in patented structure, simple installation, no need for debugging and wiring. Convenient for cleaning and battery replacement.Specifications:Power Supply: DC 9V 6F22 alkaline battery (not included)Standby Current: 10uAAlarm Current: 100mAAlarm Indication: Sound alarm & LED flashSound Level: 90dB/3MDetecting Area: 20 square meterWireless Frequency: 433MHzAPP: eWeLinkOperating Temperature: -10C ~+50COperating Humidity: 95% RHItem Size: Approx. 10.5 * 10.5 * 3.5cm (L*W*H)Package Information:Package Size: Approx. 10.5*10.5*3.8cm / 4.1 * 4.1 * 1.5inPackage Weight: Approx. 120g / 4.2ozPackage List:1* Wireless Smoke Detector1* User Manual (English) If you have any questions, concerns, or need further information, please feel free to contact us anytime. Our team is dedicated to providing you with support and answering any inquiries you may have. Your satisfaction is our ultimate goal._x005F_x005F_x005F_x000D__x005F_x005F_x005F_x000D_We look forward to offering you top-quality products and service_x005F_x005F_x005F_x000D__x005F_x005F_x005F_x000D_Thank you for your support_x005F_x005F_x005F_x000D_