Features 1、Smart Curtain Assistant: Easily upgrade curtains in 3 simple steps for any room with U shaped or I shaped track types. Perfect for bedrooms, living rooms, offices, nurseries, etc. 2、Quiet Operation: Motor works below 25dB in silent mode for slow and quiet curtain movements, great for waking up in the morning, sleep disorders, or sound sensitive individuals. Environmentally friendly and energy saving. 3、Dual Track Compatibility: Supports both U shaped and I shaped track types for versatile use in any home. Experience the convenience of smart curtains wherever you need them. 4、Efficient Power Supply: Powered by 3.7V 4000MAH lithium ion battery(built in) for fast 10m/s speed. Save energy and enjoy the smart features of this electric curtain assistant. 5、Easy Installation: No need to change the track, simply hanging the smart curtains on traditional curtains for quick automation and intelligent opening and closing. Specification Item Type: Smart Curtain Opener Material: ABS U track: Bottom Slot Width: Approx. 0 to 15mm / 0 to 0.59in Bottom Ring Width: Approx. 0 to 5mm / 0 to 0.2in I track: Bottom Width: Approx. 5 to 40mm / 0.2 to 1.57in Bottom Ring Width: Approx. 0 to 5mm / 0 to 0.2in Product Speed: 10m/s Motor Power Supply: 3.7V 4000MAH lithium ion battery x 1 (shipped with built in battery) Suitable for two kinds of track, home curtains to use Supported Rail Type: U, I track Package List 2 x Curtain Motors 1 x External WiFi 2 x USB Data Cables 1 x User Manual 1 x Screwdriver 4 x Motor Brackets 1 Pack x Small Accessory