Features: JY610 is a mini speedlight flash unit which is light weight on any camera. Flash head adjustable 0-90 degrees,more easy and convenient to use. Its guide number is GN 27 (in focal length 50mm at ISO 100 in meters). Exposure control: manual operation, fixed flash light output, non-adjustable. Quick safety lock is provided and can be mounted on any standard hot shoe. Its small size can make it possible even to carry it in your pockets. Suitable for: Cameras with universal hot shoe. for SonyA7,A7R,A7K,NEX6L,NEX6,NEX600,HX50,RX10,A99; for Canon EOS 5D,60D ,50D, 1100D,1000D and other camera with hot shoe; for NikonD3, D700,D800 D600,D3100,D3200 D3000 and other camera with hot shoe; for Pentax K-5,K-7 and other camera with hot shoe; for Olympus E5, E3, E30, E300,E-PL2, E-PL1 EL-P5 and other camera with hot shoe; for Panasonic G10GK, GH2GK, GH1GK, G2GK, G1GK, GF2GK, GF1GK and other camera with hot shoe; ( If you want this flash for Sony NEX3 NEX5R NEX5N,you should buy a flash adapter)   Specifications: Type: On-camera speedlite Guide No: 27(ISO 100 in meters / feet) Flash coverage: Same as EF 28mm wide-angle lens Effective flash range: (with EF50mm f/1.4 lens at ISO 100) 0.7-19.3m/ 2.3-63.3ft(Quick flash: 0.7-11.1m / 2.3-36.4ft) Exposure control system: Manual flash Battery: 2 * AA batteries(not included) Recycling time: Approx. 0.1-4sec(quick flash: approx. 0.1-2.6sec) Package size: 7.5 * 11 * 5.5cm / 3.0 * 4.3 * 2.2in Package weight: 141g / 5.0oz Package List: 1 * Mini Flash 1 * Bag 1 * User Manual(Chinese & English)