There are also two versions of our intelligent addressable wall sounder, the internal (MAS850LPS) and the weatherproof (MAS850LPSWP). Their highly efficient design offers excellent sound output levels despite the low current consumption. They both contain an integral short circuit isolator and have multiple tones and volume levels which can be controlled from the panel globally, or individually via site installer. We also offer a new open class Visual Alarm Device (MASB880), combining the high output sound of the wall sounders with a stronger LED to meet the EN54-23 VADs requirements. The open class functionality allows the VADs to be installed in open areas such as warehouses or airport terminals.