Use the phone for GPS? Wanna charge on the go? Want something waterproof? Wanna see your bike battery as well? LOOK NO FURTHER! Newest Blue Waterproof Motorcycle 12V 2.1A USB Charger Power Port and 3 Digital Disply Voltmeter Voltage Meter Battery Monitor Description: Best apply for motorcycle, cross bike, scooters, cars Most phones, including BlackBerry, Apple iPhone, LGENV and Motorola Razr (charging cable). Garmin's GPS, Apple iPod, or any other device using 2.1A or less USB power. Specification: Input voltage: 12V USB (output) voltage: 5V ± 0.25V Output Current: 3.1MAX Display: Blue and Red (pls indicate if not will be random) LIMITED SETS! 1pc $19.90 2pc $38.90 3pc $56.90 Installation: How to install the socket 1. Connect the red light to "+" and the black to "-" 2. Put the handle clip on the motor handle and screw it. Note: This is Aa produce designed for 12v motor bike (other voltage please do not buy this product. It may be make an accident) Install the product on the fall round and make sure your holder is set. Do not connect the Electronic Accesssories ,when the engine is not working Do not use or on the rainy day, please cover it with the waterproof shell Do not use any heat Electronic Accessories.