 "Canon ST-E3-RT Speedlite Transmitter"@en Transmitter 5743B002 - Studio Depot"@en
"
For Speedlite 600EX-RT and 430EX III-RT flashes
Two-way transmission up to 98.4' away
Compact design
8 types of custom functions
E-TTL II flash, manual flash, stroboscopic, auto external flash metering
"@en 
 Type  Radio transmissions wireless Speedlite transmitter  Transmission Range  Approx. 98.4 ft (30m) Flash Control  Ratio control: 1:8 - 1:1 - 8:1, power 1/2-stop increments Coverage  Flash coverage: Transmission Angle: 360 degrees all around  Power Source   2x AA/LRG Alkaline Batteries (Ni-MH and Lithium batteries can also be used) Battery Life: Approx. 10 hours continuously when using AA/LR6 alkaline batteries (At a room temperature of 73°F/+23°C) Dimensions   2.65 x 2.42 x 3.05" (67.4 x 61.5 x 77.4 mm)
 "BG-E14 Battery Grip for Canon EOS 70D & 80D"