Eco-friendly housing:The product is improved and upgraded, and the shell is made of reinforced plastic, which is environmentally friendly and and has strong compression resistance Anti-pressure, anti-drop, anti- Intelligent safety remote control:Remote control loss is not afraid, the device comes with the learning key can delete the remote control handle at any time,The number of handles can also be increased at any time Million passwords:Read 20 million passwords, the device can learn 20 remote control handle one-key quick switch response speed, single-key response 0.06S Colour:Black Material:plastic Package Contents: 1 x External Motor Chain Rolling Door Receiver 2 x Remote Controls 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.