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/TTL/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 580EXII, 600EX-RT via optical pulse signal; as a slave unit, it can receive signals from for 580EXII, 600EX-RT and internal flashing orders from 7D/6D/600D ect.
Support 2.4G wireless radio system, can be used as on-camera master unit and slave unit, compatible with speedlite TT685C, Godox X1C, X1T-C and X1R-C flash triggers.
The 2.4G wireless triggering distance can reach up to 100m, better to meet your needs.
Support FEC/ FEB/ FE lock.
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:
Model: TT685C (Japan Version)
Compatible Cameras: For EOS Cameras (E-TTL II autoflash)
Guide Number (m ISO 100): 60
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 1/20000s
Exposure Control System: E-TTL autoflash and manual flash
FEC(Flash Exposure Compensation): Support manual FEB: (1/3rd increments±3 stops); (Manual FEC and FEB can be combined)
FE Lock: With (FEL) button or (*) button
Sync Mode: High speed sync / 1st curtain sync / 2nd curtain sync
HSS: Up to 1/8000s
Flash Mode: E-TTL/M/Multi
Wireless Flash Function: Master, Slave, Off
Controllable Slave Groups: 3(A/B/C)
Transmission Distance: Optic: Indoors: 12 to 15m, Outdoor: 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
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: 5600K±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: 556g / 19.6oz

Package List:
1 * Speedlite
1 * Carrying Bag
1 * Users Manual(Japanese & Chinese & English)