Wireless MP40. Works great. The wetside housing is loose, but doesn't effect operation or add noise at all. Only time it's noticeable is when I'm cleaning it which I do every week when I do a water change. Very well maintained. Cord to controller has been taped as it has the normal loose cover into the housing. Has run consistently on my tank at a setting of 30% slaved to another unit. Cash or Paypal. Will only hold with Paypal payment. Pick-up only in Walnut Creek.