The video controller adopts ABS+silicone, which can safely touch the skin for a long time Long-time video viewing, neck pain, finger pain, this remote control ring device only needs to press the button to eliminate the pain. You can swipe videos while lying down, swiping while busy, swiping while sleeping during lunch break and other postures to swipe videos without feeling tired. By moving the controller, you can press the button with your index finger, eliminating the trouble of operating only with your thumb. Widely compatible: compatible with iPhone, for iPad, for iPod models and for Android smartphones and tablets. Specification: Bluetooth version: 4.0 Charging: USB Battery capacity: 20mAh Charging input: 5V-20mA Product material: ABS+silicone Product size: 202023mm/0.78x0.78x0.9 inch Product net weight: about 4g Charging time: 2 hours Life time: 24 hours Effective range: 10m Note: For IOS system, mobile phone can be used normally only after setting > auxiliary functions > touch > auxiliary touch Package Includes: 1x Fingertip Controller 1x USB Charging Cable