The Godox TT685C Thinklite TTL Flash will make it easy to create both simple and elaborate lighting setups.  It is an effective lighting tool with a powerful guide number of 197′ at ISO 100 and 200mm. Also the zoom range of 20-200mm, and the ability to tilt from -7 to 90° and rotate 360°. As a TTL-capable unit, the TT685C can also operate as a full wireless master or slave unit with TTL functionality. Also, the flash is equipped with a Wireless Control Port for attaching an optional remote control set and it has a 3.5mm sync port for basic wired connectivity. It runs on four AA batteries, the recycle time is about 0.1-2.6 seconds.

Flash Head
Guide Number: 196.85′ / 60 m at ISO 100 (200 mm Position)
Coverage: Full-Frame 20 to 200 mm / 14 mm (with Wide-Angle Adapter)
Auto Zoom Head: Yes
Bounce Head: -7 to +90°
Swivel Head: 360°
Flash Duration: 1/300 to 1/20000 Second
Recycle Time: Approx. 0.1 to 2.6 Seconds
Secondary Illumination: Modeling Light

Exposure Control
Exposure Control: Canon E-TTL / E-TTL II, Manual
Flash Modes: Hi-Speed Sync, Second-Curtain Sync
Power Range: 1/1 to 1/128
Flash Compensation: -3 to +3 EV (1/3 EV Steps)

Wireless
Wireless Operation: Radio (TTL/Manual)
Up to 328.08′ / 100 m
Optical Pulse (TTL/Manual)
Up to 49.21′ / 15 m (Master, Slave)
Wireless Channels: 32
Wireless Groups: 3
Remote Timing Modes: Instant Sync, Skip Pre – flash

Power
Internal Power: 4 x AA (Alkaline, NiMH)
External Power Pack Compatible: Yes