Two transmission ways, optic transmission and 2.4G wireless transmission, better to meet your needs.Specifications: Brand: Godox Model: TT685N (Japan version) Compatible Cameras: For Nikon DSLR cameras(i-TTL autoflash) 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 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 Function: Master, Slave, Off Controllable Slave Groups: 3(A/B/C) Transmission Distance(approx.): Optic: 12 to 15m indoor, 8 to 10m outdoor; 2.4G: 100m Channels: Optic: 4(1, 2, 3 and 4); 2.4G: 4(1-32) Slave-ready Indicator: Two red indicators blink Effective Range: 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 Item Size: 19 * 7.5 * 5.0cm / 7.5 * 3.0 * 2.0in Item Weight: 412g / 14.6oz Package Size: 20 * 9 * 8cm / 7.9 * 3.5 * 3.1in Package Weight: 548g / 19.3oz Package List: 1 * Speedlite 1 * Carrying Bag 1 * User Manual(Japanese & English & Chinese)