Contactless Infrared Door Release System with Sensor Exit Button and Doorbell Switch 0- Adjustable Time Delay. Adjustable Senstive Distance 5-20CM. Surface Installation. LED indication: Standby: Blue LED on, visitors approaching: Green LED on.<br> Wide range of use: suitable for most infrared door lock and exit switch. it can be installed on the front door, back door, side door, cabinet door, etc.Good : this product is made of high-quality materials, strong and durable. it can be used for a long time.<br> Lock: when the infrared touch switch is locked, it will automatically open and close. no need to worry about unauthorized access or other operations.<br> Access control accessories: this door lock has control buttons to open or close the door and locks all controls from either side of the door. control the entry, exit, and access with the touch of a button.<br> Led display: the led display can clearly show the status of your infrared door lock, which is convenient to use.<br> Colour:A:Black<br> Material:ABS<br> Size:8.6x8.6CM<br> Package Contents:<br> 1 * No Touch Exit Button<br> Only the above package content, other products are not included.<br> 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.