Viltrox JY-610 is a mini on-camera speedlight designed for the photographer who simply needs a very small and portable flash for fill-in light. Perfect for the traveling photographer who can't fit a big clunky flash in their or for the enthusiast photographer who just need a little bit of extra light. Also ideal for rangefinder or 4/3 cameras. The Viltrox JY-610 might be small, but it still boost a decent amount of power output considering its size with a guide number of 27 at 50 mm when extended. The JY-610 still features a 90 degree tilt function, a quick safety lock and can be mounted on any standard hot-shoe. Please note this flash is very similar to the Canon 270EX speed light, however it does not have the TTL function. Features/Specs: - On camera standard hot shoe flash - Flash Mod: Manual only - GN Number: 27 (ISO 100 in meters at 50mm at extended mode, otherwise GN is 22 at normal 28mm) - Vertical angle : 60-75-90 degree - Internal power : 2 X AA size Alkaline batteries - Weight : 145 gram (without battery)