Eco-friendly housing:The product is improved and upgraded, and the shell is made of reinforced plastic, which is environmentally friendly and durable and has strong compression resistance Anti-pressure, anti-drop, anti-corrosion 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 0.06SColour:Black Material:plasticPackage Contents: 1 x External Motor Chain Rolling Door Receiver 2 x Remote ControlsOnly 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!