Home Safe Slim Entry Alarm (H-218) How it works This product has used micro-technology to create the compact Entry Alarm. It is mount on window/door frames and will detect window/door open. The Alarm instantly turns ON...and will automatically shut OFF approximately 20 seconds Features Slim entry alarm with vibration sensor Open or vibration trigger instant arlarm 105dB alarm sound Flashing LED during alarm Power low indicator ON/OFF switch Fit to any door or window 3 button cell batteries (included) Warning sticker (included) Magnetic sensors on both left and right side #alarm #homesafe #entryalarm #secutiry #dooralaram