The GPI ThruBox is a switcher interface for connecting up to three Punchlight display units at once. It's compatible with Recording Display, Recording Lamp or Recording Strip. GPI ThruBox connects to the GPI port of SYNC I/O and works with Pro Tools HD without drivers. You can daisy-chain multiple units for more than three lamps. Features: - GPI switch for Recording Display, Lamp or Strip - Up to three lamps in any combination - Uses the GPI port of SYNC I/O - GPI in and Thru connectors - Two-color LED for recording (red) and rec ready/preroll (yellow) - No software necessary - 12V AC adaptor included - Size: 17.5 x 4.5 x 8cm