A technically advanced flashgun powered by an interchangeable lithium ion battery pack rather than all too short lived aa batteries the tli n is jammed full of features and boasts a 15 second full power recycle time with a guide number of 58 designed to integrate seamlessly with nikon i ttl systems flash exposure bracketing flash exposure compensation and flash exposure lock the tli n is also fully compatible with the nikon sb 900 and sb 910 as master or slave flash in addition to the