Abstract: A video recording device may include a firearm, a video recording device and a holster. The video recording device may include a recording unit, a lighting unit and a sensing unit. In one embodiment, a magnetic sensor can be installed inside the holster. When the firearm is disposed inside the holster, the magnetic force between the magnetic sensor and a magnetic sensing unit on the firearm can be maintained, and when the firearm is pulled out from the holster, the magnetic force therebetween disappears to trigger the video recording device to be turned on. In another embodiment, a body-worn camera is synchronized with a magnetic sensing unit of the video recording device, so when the magnetic sensing unit is triggered, the body-worn camera can be turned on along with the recording unit.