Not just an signal adaper, but also an small size wireless controller. Volume control, , forward/ media, just need to touch the button. Also it can be use as an photography button for your smart device to photography more easily. Powered by Button battery, low power cost design make it have , you don't need to change the battery for long time. Feature - Color: Black. - Material: ABS - Size: 3.5 x 3.5 x 0.8cm. - Universal: It's compatible with most Device and most 4.0+ phones / (it doesn't support navigation). - Easy to Use: Press "+"and"-" button for 2 seconds simultaneously to activate ;Then the blue light on the front side flashes;Enable for searching the front side in your mobile phones or , select Smart Remote, click on it to connect and pair. - Multiple Use: It can be use as an wireless controller, control your smart device effectively. Also can be use as an photography and music APP controller. - Long distance remote control: 10 Meters/32.8ft long size wireless control, let you use it more freely. - Battery Powered: Powered by Button battery, no extra power connect or battery required. With low power cost design, one full powered battery provide long time use. - Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! Thank you! Package list: 1 x Button