Viltrox Speedlite JY610, mini manual flash, very small size (64 x 65 x 76.5 mm) and light (145g), for all type of cameras with flash shoe, especially for mirrorless and compact cameras, Mod. JY-610 (US) Manual flash. Guide No.: 27 (ISO 100 in meters / feet). Flash coverage: Same as EF 28mm wide-angle lens. Effective flash range with 50mm / 1.4 lens at ISO 100: 0.7-19.3 m / 2.3-63.3 ft. (Quick flash: 0.7 - 11.1m / 2.3 - 36.4 ft). Battery: 2 x AA (NOT included!), approx. 100 - 680 flashes. Dimensions: 64 x 65 x 76.5 mm / 2.5 x 2.6 x 3.0 inch. Weight: approx. 145 g / 5.1 oz (excluding batteries). Manual in English only!