B00H7XFOKO Yongnuo Speedlite Wireless Transmitter YN-E3-RT for Canon Cameras AS ST-E3-RT

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Power Source: 2 AA/LR6 alkaline batteries Ni-MH batteries (Best with Polaroid AA/LR6 batteries)
Wireless flash shooting time: Approx. time: 10 continuous hours ** when using AA/LR6 alkaline batteries
Power saving: Power off after 5 min. of idel operation
Weight: Approx.110g(transmitter only, excluding batteries)
Firmware update: Provided