Dahua HY-SA21A-W2 Wireless Smoke Alarm

• Wireless smoke alarm with split-spectrum sensor technology for enhanced detection. • Features a single button for both test and silence functions. • Emits a loud alarm sound exceeding 85 dB(A) at 3 meters. • Designed for low quiescent current consumption, extending battery life. • Utilizes a Surface-Mount Device (SMD) circuit board for compact design. • Includes a low battery warning signal to ensure continuous protection. • Brand new condition, suitable for residential and commercial safety.