Focus range (cm): 0.5 times, 1cm before the corner tip, 2 tips Strobe Power switch: ON/OFF switch Preparation for light: Display Red LED on Power supply: 3V CR2 1 unit Number of times that can be emitted: Approximately 350 times Mount: Canon EOS, Nikon, Pentax mount Operating temperature range: 0 to +40°C External dimensions (mm): Total length 130mm, outer镜头镜φ65