Skaarhoj ETH-GPI Tally control box for Blackmagic ATEM switcher

Description

Used Skaarhoj ETH-GPI. This was one of two that were used in production with an ATEM Constellation 8K, but wanted to move them to my Constellation HD ME/2. Skaarhoj says this WILL NOT WORK with the new Constellation HD 2M/E and that's why I'm selling them. Item comes as pictured (box only). Configuration software and more info online at skaarhoj dot com. Paid 9 two years ago.
From Skaarhoj:
ETH-GPI Link
Available Product id: ETH-GPI-Link-V1
Setting up an I/O device have never been this flexible. Connect and control anything from your tally lamps, trigger ATEM switcher routines, control a HyperDeck, change Scopes on a SmartScope Duo and route inputs/outputs on a VideoHub. Defining parameters – single or multiple - for inputs/outputs is extremely fast, thanks to the drop-down menu structure in UniSketch OS. Connect and control up to 8 devices at the same time!
The general-purpose I/O controllers offer 8/16 inputs and 8/16 outputs, all electrically separated with quality relays and optocouplers. GPO is implemented with relays shorting to GND. GPI implemented with optical isolators shorted to GND.
Please notice: SKAARHOJ Controllers with GPI inputs accept open collector and relay outputs (pulled to GND). The default HD15 tally connector on the TriCaster TC1 does not provide a direct working signal to the ETH-GPI Link. Converting the 5V potential to GND is needed.