The Altair 4X charger docks allow quick and easy charging of the MSA Altiar 4X with either a cradle for a single instrument or a multi-unit charger that can charge up to 4 instruments at a time. The cradle allows for constant visibility so it can be found at a certain location in the office. The cradle also allows for a quick pick up and go design. Features and Benefits: Charging cradle allows for easy location and handling of a single instrument and allows easy charging Multi-unit charger allows charging of up to 4 instruments in one easy charger