Description/Features: 1. Bluetooth 3.0, Uses Two Aaa Alkaline Batteries, Ultra-Thin Design, Main Body Thickness Is Only 6.7mm 2. The Button Cover Is Made Of High-quality Laser Material, With A Thickness Of Only 2.5mm 3. , Quiet Button Sound, 78-Button Design 4. Compatible With for Computer Windows Operating Systems, Such for Windows2000, Nt, Xp, Vista, Etc., No Driving Required. 5. Compatible With for Os , for And Mobile Phone Os 4.0 Do Not Need To Install Any Driver And Can Be Used Directly; Compatible With for Windows Mobile , No Driver Is Required And Can Be Used Directly Specifications: Color: white Material:plastic Number Of Keys: 78 Keys Waterproof Function: Does Not Support Waterproofing Applicable Models: Connection With Computer: Bluetooth Type: Bluetooth Keyboard Battery Model: 2 AAA Batteries (Not Included) Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 x Keyboard 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.