Neewer MK-300 TTL LCD Flash Speedlite for Sony A7/A7R/A7S A6000 A3000 NEX-6 NEX-7 A33 A35 A37 A57 A58 A77 A77II A99 Cameras Powerful Flash with High Guide No.32(ISO 100, 105mm). Support TTL, M, RPT flash mode8 steps(1/1 to 1/128) power output Recycle time 6 second (with 2pc AA alkaline cell) Power save mode, Overheating protection and Memory function NOTEWith Hot Shoe Adapter MK-SH20 for Sony NEX-3 NEX-5 Series do not Support TTL