The Aqara Smoke Detector is a wireless safety device designed to protect your home by sensing smoke through photoelectric technology. Available in both an online version (SD-S01E) for smart home integration and an offline version (SD-S01D) for standalone use, it promptly triggers a loud 85 dB sound and a light signal when smoke concentrations reach a set threshold. This compact white device measures 104.6 × 42 mm and weighs 159 g, making it discreet when mounted on a ceiling. It operates using a CR17450 3V battery and utilizes the Zigbee protocol for stable wireless communication. For those using the online model, it integrates seamlessly with Apple HomeKit, Yandex Alice, and IFTTT, allowing you to receive safety notifications directly on your smartphone. Designed for interior installation, the detector is easy to set up using the included mounting plate and adhesive sticker. It functions reliably in temperatures from 0°C to 40°C and humidity levels up to 95%, ensuring consistent performance in most living room or bedroom environments.