Fangrui Product Details 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 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 Mobile , No Driver Is Required And Can Be Used Directly Description: 1. Number Of Keys: 78 Keys 2. Waterproof Function: Does Not Support Waterproofing 3. Applicable Models: 4. Connection Method With Computer: Bluetooth 5. Type: Bluetooth Keyboard 6. Battery Model: 2 Aaa Batteries (not Included) Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Material: Plastic Colour: White+silver Package Contents: 1 X Keyboard Only The Above Package C