DESC: DSC is proud to introduce the new standard for life safety security, the WS4916 wireless smoke detector with built-in heat detector. This low-profile detector incorporates automatic drift compensation, high/low sensitivity trouble and early low battery indication. It's UL and ULC Listed for commercial and residential installations and is perfect for those applications where running a wire to a smoke detector is just not possible. * Low profile design * Automatic drift compensation to maintain constant sensitivity * High/low sensitivity trouble * Built-in heat detector - 57°C (135°F) * Easy maintenance replaceable chamber * Local test button * Built-in 85 dB horn * Built-in low battery detection Item Code: WS4916