Godox TT600 Built-in 2.4G Wireless Transmission Speedlite Flash with Godox X1N TTL Wireless Remote Flash Trigger for Nikon The number of flashes is about 230(2500mA NI-MH battery). Full flash recycle time is up to 0.1-2.6s(Use Panasonic eneloop batteries). High Guide Number: GN60(m ISO 100), short flash duration, high illumination, far Irradiation distance. Stable color temperature at 5600200K over the entire power range. Adopts Godox wireless X system with built-in 2.4G wireless transmission, Godox AD360II-C/AD360II-N flash, TT685C TT685N flash, X1T-C/X1T-N trigger and other devices that with wireless control system. High-speed Sync: Can realize HSS when used with Godox Cell-II trigger or X1C/X1N TTL wireless trigger (Sold Separately), the max speed can up to 1/8000s (Depend on the cameras). It's particularly convenient when using the aperture to fill flash on portrait preferentially. Note: The TT600 can NOT realize HSS when used on camera hot shoe. Both Optic Transmission and 2.4G Radio Transmission available, offers more stable signal, farther distance, wider range of application, less power consumption, less affected by the obstacle.