Software Upgrade Guide (USB):
https://myosuploads3.banggood.com/products/20200311/20200311041337EV300DSoftwareUpgradeGuideUSB.pdf

Firmware: MERGE.zip( EV300d Release Notes V0.2.25    2020-02-25 )

Click here to download the manual: 
myosuploads3.banggood.com/products/20191110/20191110214741EV300D.pdf
More parameter:
myosuploads3.banggood.com/products/20191108/20191108030652-converted.pdf

Eachine EV300D FPV Goggle Specifications:

Frequency: 5.8GHZ

Frequency range: 5333—5945 M Hz

Receiver Sensitivity: ≤-93DB

Antenna impedance: 50Ω

Audio and video: AV in/out

Video format: NTSC/PAL

Brightness: Adjustable

Contrast: Adjustable

Pupil Distance adjusting: 56-72mm

Focal length adjusting:Under 800 degree of myopia and Hyperopia 300 degrees

Eyeglass frames: astigmatism/ myopia/hyperopia(Diopter lens not include)

Power input: DC 7.4V-28V

Minimum voltage: 6.8V

Operating temperature:-10C ~ 40C

Package Included:

1 X EV300D goggles

1 X Zipper case

1 X 18650 battery case

1 X Sponge

2 X EVA pad

2 X Eyeglass frames

2 X Third party module cover

2 X FPV receiver

1 X Lens wiping cloth

1 X User Manual
Note: not included the battery and antenna