1、Silent ABS keyboard, designed with American English layout, offers you user-friendly typing experience. 2、V0 Bluetooth chip ensures fast and stable connection speed, smooth typing and lower power consumption. 3、Universal for iOS / Android / Windows operating system. Compatible with all Bluetooth supported devices, phone, tablet, laptop, etc. 4、Built-in rechargeable battery support 80 hours of continuous work and standby for 100 days. 5、Folding and portable design, easy to carry. PU surface is of good texture and durability. Features: Silent ABS keyboard, designed with American English layout, offers you user-friendly typing experience. V 3.0 Bluetooth chip ensures fast and stable connection speed, smooth typing and lower power consumption. Universal for iOS / Android / Windows operating system. Compatible with all Bluetooth supported devices, phone, tablet, laptop, etc. Built-in rechargeable battery support 80 hours of continuous work and standby for 100 days. Folding and portable design, easy to carry. PU surface is of good texture and durability.  Specification: Material: ABS+PU leather Bluetooth version: 3.0 Working range: up to 10 meters Layout: American English Battery: Built-in 140mAh   System requirements: for iOS/Windows/Android  Standby time: 100 days Uninterrupted working hours: 80 hours Charging time: 1.5-2 hours Keys life: 5 million times Package List: 1 * Keyboard 1 * Charging cable 1 * Instruction manual