Eliminate the need to carry 2 chargers! This y-split cable charger allows for simultaneous charging of your micro usb phone charge and any companion product or any device needing another micro usb input. The cable fits precisely into your existing USB output be it on Laptop, USB outlet wall charger or USB car charger (sold separately). An ideal charging solution if only one USB outlet is available. No need to swap devices on a single charger. Note: Charging time will increase slightly for the phone when the companion product is simultaneously connected to the charger.