Note: This product does not contain a battery, the battery needs to be purchased by yourself Product include 1 X The wireless finger uses reliable wireless technology to provide wireless connectivity within 10 . Special ring design, sensitive optical , and exquisite design. Powered by 1 AAA battery. It has an automatic standby sleep mode. Product description Applicable to Android smartphones with version 4.0 or higher, Android tablet with , TV, desktop with adapter, laptop, etc. Note: Not available for i or Mac such as or . No need to install the driver, plug in the receiver to use. It is very helpful for users who always bring their laptops to the office. You can type when using the . Tip: Users who are used to typing with two hands may not be very convenient. Ergonomic Design - The EIGIIS Mini Wireless Ring is ergonomically designed for hand bending and allows the hand to move anywhere on the leg and body. The wireless finger in the elbows and wrists for extended periods of time. No Need To Install The Driver, Plug In The Receiver To Use. Product Description 1 X The Wireless Finger Uses Reliable Wireless Technology To Provide Wireless Connectivity Within 10 . Special Ring Design, Sensitive Optical , And Exquisite Design. Powered By 1 AAA Battery. It Has An Automatic Standby Sleep Mode.