Feature: 1. Energy Saving Patent Design. 2. Built-in Rechargeable Lithium Battery Pack 3. It has automatic correction function for the displacement generated by braking 4. The built-in control parts of motor are sealed well for better safety 5. It\u0027s easy to switch the mode between inching and interlock and control operation direction 6. Electronic limits setting, 6 limits can be set (2 end limits and 4 middle limits) 7. Short circuit conservation \u0026 open circuit conservation for sensor 8. Built-in low power Zigbee module and APP intelligent control function 9. Compatible with Alexa Echo and Home for easy voice control 10. Build-in RF433 receiver for multiple controlling modes, availavle for adding convenience to control connected devices Specification: Item Name: Tubular Roller Blinds Motor Motor Diameter: 25mm Driving Tube Diameter: 38mm Charging Voltage: DC 5V Current: 900mA Power. 6.7W Torsion: 1 N.M Rotate Speed: 30rpm Smart Control App: for Smart Life Voice Control: for Home Load Bearing: 4 KG Power Supply: built in 5V 900mAh li ion battery Material: Aluminium alloy Total Length: 42cm / 16.53 inch Product Weight: 436g / 15.38oz. Package List: 1 x Tubular Motor(RF remote not included) 1 x USB Charging Cable 1 x Basic Accessories Kit 1 x User Manual (English)