It comes with 2 rechargeable batteries.
But it does not say it record while charging,as the Sunlea does, while as regards Action Cams, look at this one with 4.5 out of 5 stars 2,807 customer reviews:
FITFORT Action Camera 4K WiFi Ultra HD Waterproof Sport Camera 2 Inch LCD Screen 12MP 170 Degree Wide Angle 2 Rechargeable 1050mAh Batteries Free Travel Bag Include 19 Accessories Kits
【100% 4K HD Action Camera】: Provides 4K/25FPS, 2.7K/30FPS, 1080P/60FPS, 1080P/30FPS and 720P/120FPS Video Resolution. 12MP Image Resolution & 170 Super Wide Angle Lens Delivers Skip-Free HD Video and Accurately Capture Every Epic View And Exciting Moment For You .
【Sufficient Power Supply】: Comes With 2 Rechargeable 1050mAh Battery(one in the camera, one in the box) Enables Continuous Recording Without Worry. Supports Up To 90 Minutes Recording For Each Battery.
And excerpts from the answers section: 2 3/8 " wide; 1 " deep (add 1/4" for lens thickness); 1 5/8" tall... records while charging. you charge the camera's battery and/or power the camera through the USB port . The longest record time is 320 Minutes if you choose 720P 60fps w/ a 32gb micro sd card in it, but a 64gb card CLASS 10 speed rating will work. The speed rating is very important to action camera. it has a time lapse mode.. Make sure the rear screen isn't staying on when you are filming. I get somewhere around 1 to 1.5 hours per battery. I tried the 1080 p bit the file size was huge. it doesn't include the micro SD card. It comes with a USB charging cable. adapter micro usb to aux connector.
When you charge,the blue and red light will be turn on in the same time. ,when you charge it ,the blue lights will turn on ,when you record, the red lights will turn on. Now the blue light is out ,it shows that it is fully charged You can get a couple extra batteries and a stand-alone USB charger as a free gift after you receive the camera. It t records sound. You need set up it on your settings. In the camera there is a "sound indicator" option ,choose it and you will see "volume" option ,adjust the volume to 3. remove the waterproof case when you want to record sound And it has a good quality and also has speakers. you can connect a mic to it via a adapter micro usb to aux connector.
If you plug the camera in via USB on your computer, it will show up as a flash drive. Alternatively, you can take out the microSD and use an adapter and an SD card reader to access it directly.
Turn on the camera,you can choose video resolution,press the select button then you will see 1080p(60fps),1080p(30fps),4k(25fps), then use the down button to select it. loop setting can be set to automatically overwrite and record over the old video. Press three times Power/mode to enter into Setup menu; Then select Loop recording by pressing Up/Down button. The time lapse is：2s, 3s,5s,10s,20s,30s,60s. In daylight, the videos are really nice (really, really nice). Once you start losing light, then yes, the picture becomes grainy. it takes photos, but it still will have the "fish eye" lens look to them. 4k is barely watchable with the 25fps, 1080p at 60fps is butter! can't turn off the "fishbowl" effect of photos and/or videos. ________________
Reading this makes me wary of poor video quality in less than full light, plus loss of detail due to fish bowl effect.