Powerextra speedlite with a guide number of 33 (ISO 100/1m), Support manual mode, S1 and S2 wireless flash trigger modes, Single-contact hot shoe.
Approximate 3.0 seconds flash recycle time, Power saving automatic shutdown function, automatic save function. For a test flash, Press the test button to fire a test flash with the current mode settings.
The flash has 8 level of power output control which indicated by 8 pieces of LED lamp for different level. Powered by 4 pcs AA-size battery backup, provides PC port, you can make the flash synchronous by connecting to the PC port.
Head Rotation: Vertical Rotation Angle: 0~90 Degrees, Horizontal Rotation Angle: 0~270 Degrees.
Package included: Powerextra DF-400 speedlite ×1, Protective bag ×1, Mini Stand ×1, Instruction manual ×1

1. Electronic structure:Insulated gate double-click the transistor automatically(IGBT)
2. Guide number:33(ISO 100/1M)
3. Power:4x AA batteries
4. Battery life:110-1500 times
5. Recycle time:3 seconds
6. Flash mode:M,S1,S2
7. Color temperature:5800K
8. Flash duration:1/200 seconds~1/20000 seconds
9. Flash control:Magnitude 8 brightness control(1/128-1/1)
10. Dimensions:190x75x55mm
11. Net weight:315g

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Advantage:
M mode
In this mode,you can adjust flash brightness according to your own preference,the speedlight will flash under the camera synchronous signal S1 mode
In this mode,DF-400 will trigger flash with the main speedlight first flash,the effect is the same as using radio trigger.When using this mode,your main speedlight should be set to manual flash mode,using neither TTL flash system nor red-eye removal function which caused multiple flash
S2 mode
S2 mode is similar to S1 mode and is also known as "preflashing cancel mode",but it can ignore the preflashing from TTL,so you can use it to support the main speedlight that working in TTL mode.In particular,if S1 mode is unable to synchronously flash with your built-in speedlight,you can try to use S2 mode

1x Flash lamp
1x Protection bag
1x Mini stand
1x Instruction manual