Ideal for testing RTS blinds onsite when a permanent power supply is unavailable. Quicktest Safe Block is constructed from tough impact resistant and flame retardent materials. The lid incorporates a fuse and switching device. When the lid is open the coloured cable clips are isolated from the supply. When the lid is closed, the power is connected to the cable clips. A glowing neon lamp - visible with lid open or closed - indicates when power is connected to the device.