NiceFoto TTL-680C 600Ws GN68 1/8000S HSS 2.4G Bowens Mount Wireless Studio Strobe Flash Light with Bulit-in 6600mAh Battery - 500 Full Power Flashes Supports First/Second Curtain Sync for Canon 600Ws, GN68, 500 Full Power Flashes and 0.1-5.5s Recycle Time. Stable color temperature at 5600200K over the entire power range. TTL is available at P/TV/AV/M. Fully support High-speed sync (up to 1/8000 seconds), first-curtain sync and second-curtain sync. 5 steps of high speed flash duration(1/20000s, 1/15000s, 1/10000s, 1/8000s and 1/5000s) can help you capture a fast moving subject. Advanced multi-flash system. You can choose 5/10/15/20/25 Flash Times and 1 flash/s, 2 flash/s 10 flashes/s Flash Frequencies. Transmitter Included and Built-in 2.4G receiver, conveniently set your flash parameters, 100M Wireless Control with precision.