- Allows limited operation of VELUX skylights during power failures
- Enough power to operate one skylight
- Battery is charged automatically by the VELUX VSE or VCE skylight
- Charges automatically both before and after power failure
- Works with the skylight's rain sensor to automatically close the skylight if it rains
- When the battery reaches a minimum level, the KLB 100 automatically closes the skylight; skylight cannot be operated until the power supply has been re-established