Connect Systems got off to a good start in the earlier days of DMR with the CS700 (UHF) and CS701 (VHF) – these became very popular and many are still in use. CSI were due to improve the radio by way of firmware updates however this never materialised.

CSI then released the CS750 (UHF) and CS751 (VHF) however the price tag was way above their previous range and they slowly faded out of the UK market.