Neewer NW690 I-TTL Slave Camera Flash with Wireless Remote Slave FunctionAdvanced Wireless Lighting for Nikon D3, D3X, D4, D4S, D90, D300, D300S, D600, D610, D700, D800, D800E, D3000, D3100, D3200, D3300, D5000, D5100, D5200, D5300, D7000, D7100 Powerful Flash with High Guide No. 58 (m) / 19ft(at 15mm focal length,ISO 1 in meters/feet). Multi-flash Lighting Application; Charging socket for external power pack: adds a charging socket for external power pack. PC synchronous port: simple for you to use the PC synchronous line. Compatible with Nikon DSLR Cameras Backed with Neewer 1-Year 1% Satisfaction Guarantee.