Bad Elf provides GPS information to popular aviation apps using a high quality 66 channel WAAS GPS. It works with all iOS devices such as iPad, iPhone and iPod Touch. Bad Elf plugs into the bottom of the iPad or iPhone and includes a USB port which can be used to sync and charge the iPad or iPhone. Furnished with a detachable lanyard. Compatible with iPad 1 and 2, iPhone 4, iPhone 3GS, iPhone 3G, iPhone, and iPod Touch 1G-4G.