Function: 1. Light Alert: The LED light blinks once when the remote control button is pressed, and keeps blinking when the alarm is triggered. 2. anti-theft mode: Open the door immediately sound and light alarm for even if the door is closed in advance, the alarm will sound for . 3. Welcome Mode: Door Magnetic "Ding " when opening the door 4. SOS mode: encounter danger manual alarm press emergency key (S0S) sound and light alarm " 5. Alarm mode: open door alarm, close door stop alarm DDT model: theft prevention of valuables siren size: 9 x 4.3 x 1.3cm remote control size: 6 x 3.3 x 1cm magnetic strip size: 4.5 x 3.3 x 1.3cm Material: ABS colour: white Package Contents: 1 x siren 1 x magnetic strip 1 x remote control 1 x sticker 2 x AAA batteries Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.