To be used with control panel CG-8800/CG-8800PLUS/CG-8800K8 by mounting a wireless siren driver WS-1000 on the control panel, or used with a remote control and other detectors to make it as an on-site alarm. 110dB detering siren, built-in flash light, 10 seconds digital high-fidelity voice message recording, automatic replaying. SIZE:180X140X70MM