LevelAssist is a multidirectional tone bubble level that indicates through acoustic feedback the adjustments to be performed. No need to take a look at your bubble level just listen to it! Position your iPhone on a place to be leveled and indicate the direction toward which you are going to lift and/or pull down. LevelAssist will then be sending out high-pitched beeps if you need to go further up and low-pitched beeps if you need to go lower. Extremely accurate, LevelAssist allows to adjust the level of many commodities: dressers, cabinets, ping-pong tables, caravan or motorhome, etc …. Tips : to better hear the sounds, you can connect through Bluetooth your iPhone to a bluetooth speaker ( or to your vehicle sound system) !