Neewer&reg; Li-ion Battery Flash E-TTL I-TTL HSS Master Slave Flash Speedlite for Canon & Nikon DSLR Camera with Rechargeable 2400mAh Battery+ Charger(NW 870) Powerful flash with high guide number 58(ISO 100,180mm) Various flash modes:TTL/M/Multi/Master/Slave/S1/S2/FEB Equipped with LED auto assist beam to help you focus when in dim places;Large LCD screen for simplified control, easy to understand and use Rechargeable Lithium battery for longer usage, enerygy saving and environment protection Additional Features:Rear Curtain Sync,Power Saving Mode,Overheat Protection,Custom function,Voice Prompt,Auto save,FEL/FV,FEC