Two transmission ways, optic transmission and 2.4G wireless transmission, better to meet your needs. Features: Powerful flash with guide number 60m at ISO 100. Supports multiple flash modes M/RPT/Multi. Support high speed sync, 1st curtain snyc and 2nd curtain sync, the maximum shutter sync is up to 1/8000s. Support optic transmission, as a master unit, it can control other speedlights, such as for Nikon SB-900 and SB-910 via optical pulse signal; as a slave unit, it can receive signals from for SB-900 and SB-910 and internal flashing from D7100/D7000/D800 ect. Support 2.4G RT system, built in 2.4G radio transmitter and receiver, can be used as on-camera master unit and slave unit of 2.4G RT system, compatible with speedlite TT685N, Godox X1N, X1T-N and X1R-N flash triggers. The 2.4G wireless triggering distance can reach up to 100m, better to meet your needs. Support FEC/ FEB functions. Multiple flash groups, it supports A/B/C groups. Supports auto and manual zoom, the flash coverage can be changed between 20-200mm. Sync port and USB port. Specifications: for Nikon D7100 D7000 D5200 D5100 D5000 D3200. Type: Compatible Cameras:for Nikon DSLR Cameras(i-TTL auotflash); Guide Number:GN 60m(ISO 100); Zoom Range:20-200mm auto and manual zoom(14mm with wide panel); Adjustable Flash Head:0~360°horizontally and -7°~90° vertically; Flash Duration:1/300 to 1/20000 seconds; Exposure Control:; Exposure Control System:i-TTL autoflash and manual flash; FEC(Flash Exposure Compensation):; Support Manual.FEB:(1/3rd increments±3stops); (Manual FEC and FEB can be combined); Multi Flash:Provided(up to 100 times, 199Hz); Sync Mode:High speed sync / 1st curtain sync / 2nd curtain sync; HSS:up to 1/8000s; Flash Mode:i-TTL /M /RPT; Wireless Flash(optic and 2.4G); Wireless Flash Function:Master, Slave, Off; Controllable Slave Groups:3(A/B/C); Transmission distance(approx.):Optic:; Indoors:12 to 15m; Outdoors:8 to 10m; 2.4G:100m; Channels:Optic:4(1,2,3 and 4); 2.4G:4(1-32); Slave-ready indicator:Two red indicators blink; Auto Focus Assist Beam; Effective Range(approx.):Center:0.6m-10m; Periphery:0.6m-5m; Power Supply:4 * AA Alkaline or NIMH battery(Not included); Recycle Time:Approx 0.1-2.6s; Sync Triggering Mode:Hotshoe,3.5mm sync line, wireless control port; Color Temperature:5600±200K; Dimension:; Item Weight:412g / 14.6oz; Item Size:19 * 7.5 * 5.0cm / 7.5 * 3.0 * 2.0in; Package Weight:530g / 18.oz; Package Size:20 * 9 * 8cm / 7.9 * 3.5 * 3.1in; Package List: 1 * Speedlite; 1 * Carrying Bag; 1 * User's Manual