Replacing the lens of the SJ4000 :
 

Little Town in the Woods FPV Shot with SJ4000 :

Ancient Ruins (Rhamnous), Gorge and Sea FPV QR X350 PRO Shot with SJ4000 :

SJ4000 vs SJ1000 Second Test (Scattered Clouds, Sea, Sunset) :

Description:
High-definition digital motion video recording device tailored to market demand.
SJ4000 camera has a variety of industry-leading features including digital video recording, photo shooting, audio recording, video display and detachable battery, which makes SJ4000 camera perfect for vehicle data recording, photo-shooting, outdoor sports, home security, deep-water probing, etc., allowing you to film at anytime, anywhere. 
Water-resistant casing that allows you to film fascinating water sports; water-resistant up to 30 meters under water
High definition screen that displays and replays fascinating videos recorded.
Detachable battery that is easy to replace and prolongs your camera’s service life.
Video recording while charging.
Video recording with battery.
12-megapixel HD wide-angle lens.
Web camera.
Support storage cards up to 32GB maximum.
Multiple video recording formats: 1080P   720P   WVGA
Recorded in MOV format
Multiple photo shooting modes: Single shot, Snapper
Video encryption enabled                                                                                      
Mini appearance, diversified colors available

Specification:

Package Included: