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The KLB 100 Battery backup can be used for electrical operated skylights. The battery backup ensures that skylights can be closed and blinds raised in case of power failure.
About the Velux KLB 100 Skylight Battery Backup for Electric Venting Skylights
The Velux KLB 100 Battery Backup for Electric Venting Skylights. KLB 100 Battery Backup is an optional accessory for VSE and VCE models. Battery Backup ensures limited operation of Velux electric venting skylights if the re are any power failures. If the battery reaches a minimum level, the KLB 100 will automatically close the skylight and open or raise the skylight blinds. After this power supply has to be reestablished, to operate the skylight and blinds.