Compatible with Canon EOS Cameras(E-TTL II auotflash) Guide No.(1/1 output @ 200mm): 60(m ISO 100) / 190(feet ISO 100) Flash coverage: 20 to 200mm (14mm with wide panel) Auto zoom and Manual zoom Flash Duration: 1/300 to 1/20000 seconds Exposure control system: E-TTL autoflash and manual flash Flash exposure compensation(FEC): Manual. FEB: ±3 stops in 1/3 stop increments (Manual FEC and FEB can be combined.) Sync mode: High-speed sync (up to 1/8000 seconds), first-curtain sync, and second-curtain sync Flash Mode: E-TTL /M /Multi Wireless flash function: Master, Slave, Off Controllable slave groups: Optical(2, A and B); 2.4G(3, A, B and C) Transmission range (approx.) 2.4G ≤ 100M Optical Indoors: 12 to 15m / 39.4 to 49.2 ft. -Optical outdoors: 8 to 10m / 26.2 to 32.8 ft. Master unit reception angle: ±40° horizontally±30° vertically, ·2.4G: 100m Channels: Optical 4(1,2,3,4); 32 (1-32) Auto Focus Assist Beam Effective range(approx.): Center: 0.6-10m/2.0-32.8 feet, Periphery: 0.6-5m/2.0-16.4 feet Sync Triggering Mode: Hotshoe, 3.5mm sync line,Wireless control port Color Temperature: 5600±200k Package List: 1 * TT685C Speedlite 1 * Carrying Bag 1 * Mini-Stand 1 * Manual 1 * USB LED 1 * Diffuser 1 * Filter