This is a digital spirit level that fits onto the hotshoe of your film or digital slr camera. It uses a number of LED lights to confirm when your camera is perfectly straight. The LED brightness can be adjusted as can the sensitivity. It can be used in horizontal or vertical formats and as it is located just above eye level can be easily seen whilst looking through the viewfinder. It is powered by 2x CR1220 batteries and comes with 6 batteries in total. Minolta or Sony SLR cameras require the Lanbo Flash Hotshoe Adapter For Sony D-SLR Cameras(LB-3007) in order for the Action Level to attach to the hotshoe.