Buy a SJ4000 here

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Buy the SJ5000 here

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SJ4000 has an upgrade: SJ4000

 SJ500 vs SJ4000

Look
Effective Pixels	14 MP CMOS	12 MP CMOS
WiFi	Supported, Android, iOS APP	Unsupported
Lens	170°viewing angle，4x digital zoom	170°viewing angle，4x digital zoom
Photo Resolution	1920X1080P(30fps), 1280X720(60fps)	1920X1080P(30fps),1280X720(60fps)
Accessories	Compatible with GoPro Accessories	proprietary accessories
Battery Capacity	1150mAh	900mAh
Price	$89.99	$85.99

SJ4000 battery life

The original battery from SJ4000 lasts about 100 minutes recording on 1080P with HDR off and about 70 minutes with HDR on so you will probably need another battery like i do so if you need spare batteries buy them here.

SJ4000 protective case

Where to buy a big case for SJ4000 ? Buy it here.

SJ4000 tripod

Where to buy a perfect tripod? Buy it here.

Filters for SJ4000

If you want to buy them click here.