I assume you mean the Logitech Ergo K860 (CH, Wireless) variant (manufacturer number 920-009874) Exact specs can be found at https://www.logitech.com/de-ch.... The specs for 920-010347 can be found at https://www.logitech.com/de-at.... The cheaper model should come with Unifying receiver and the other (business model) with Bolt receiver. So the main difference should be in the transmission technology.