LaserShield WDU-0013301 Wireless Detection Unit Features include built in 105-decibel siren, emergency panic button, built in back up battery, pet friendly Sets up in seconds, no installation or programming 24/7 Emergency response service starts 19;95 per month; Monitoring is optional and requires no long term contract or credit check; Activation details included with system Assembled dimensions inch; depth: 5 height: 6-1/6 width: 3 weight: 1-1/2-Pound Requires lasershield basic starter kit for use