Inflow control device

An inflow control device comprising a housing 1 defining a first valve seat 12 for receiving a gate 3 in a closed state, and a second valve seat 11 for receiving the gate in an open state, wherein the first valve seat and the second valve seat comprise one or more permanent magnets, or wherein the gate comprises one or more permanent magnets. The housing may comprise one or more electromagnets and may comprise a resonant circuit able to receive electromagnetic energy from a mobile controller and to electrically energise the one or more electromagnets. Also claimed is a wireline mobile controller electrically and mechanically connected to the wireline and comprising an electrical component arranged to couple electromagnetically to an inflow control device when the electrical component is electrically energised, and to open or close the inflow control device remotely. The wireline controller may comprise an electromagnetic transmitter arranged to emit at least two electromagnetic pulses at different frequencies.