Product description Model: TT685II Guide No. (1/1 outlet, 200mm): GN≈60 (m ISO100) Flash duration: 1 / 300s-1 / 20000s Flash coverage: 20-200mm Auto zoom (flash coverage set automatically to match the lens focal length and image size) Manual zoom Swinging / tilting flash head(bounce flash): 0~330 ° horizontally and -7 °~120 ° vertically Exposure control Multi flash: provided (up to 100 times, 199Hz) .