The Bosch GAA 18 V-24 USB battery adapter is intended for use with a Bosch 14.4V or 18V lithium-ion battery. The battery adapter has two USB ports and one heating element which is ideal for Bosch heated jackets. The adaptor is a brilliant on-the-go solution for the busy tradesman giving you instant access to a charging port when and where you need it.This ultimate battery accessory can be used to charge the battery runtime of various battery-operated USB devices, such as mobile phones, MP3 players or tablet PC\'s. Simply plug the charging cable of your USB device into the USB socket on the adapter and press the \"on\" button to activate the battery adapter. The \"On\" button lights up if the adapter is active. If no charger cable is connected, the USB ports are automatically disabled after 30 seconds and the \"on\" button goes out.