If you are EOS M3 user, please don't buy now.
This product is not Not fully compatible with EOS M3.

Type:
Campatible Cameras: Canon Camera(TTL autoflash)
Guide No. (1/1 output @ 105mm): 36 (m ISO 100)
Flash Coverage: 24 to 105mm
Flash Duration: 1/350 to 1/20000 Seconds
 

Exposure Control:
Exposure Control System: TTL Autoflash and Manual Flash
Flash Exposure Compensation(FEC): Manual. FEB: ±3 stops in 1/3 stop increments (Manual FEC Can be Combined.)
Sync Mode: High-Speed Sync(up to 1/8000 Seconds), First-Curtain Sync, and Second-curtain Sync.
Multi Flash: Provided (up to 90 times, 99Hz)
 

Wireless Flash (2.4G Transmission):
Wireless Flash Function: Master, Slave, Off
Controllable Salve Groups: 3(A, B and C)
Transmission Range(approx.): ≤30m
Channels: 16(1-16)
 

Auto Focus Assist Beam:
Effective range(approx.): Center: 0.6-4m / Periphery: 0.6-2.5m

Power Supply:
AA Batteries: Ni-MH Batteries(recommended) or 2*LR6 alkaline batteries
Recycle time: Approx.0.1-2.2 seconds (eneloop Ni-MH batteries of Panasonic). 
Full power flashes: Approx. 210(2500mA Ni-MH batteries)
Power saving: Power off automatically after approx. 90 Seconds of idle operation. (60 minutes if set as salve)

Dimensions:
W x H x D:  140*62*38mm
Weight without battery: 200g

Package Including:

• 1 x TT350C Camera flash
• 1 x Mini stand
• 1 x Protection bag
• 1 x Diffuser
• 1 x User Manual