A computer mouse that includes a plurality of tunable switch assemblies is disclosed. According to certain embodiments, the tunable switch assembly comprises a plurality of tunable switches and a rotatable wheel casing that houses the plurality of tunable switches. Each tunable switch of the plurality of tunable switches is distinct from any other tunable switch in the plurality of tunable switches in a given tunable switch assembly of the plurality of tunable switch assemblies, according to certain embodiments.

A roller module includes a roller, a circuit board and a bracket. The roller includes an operating part and a turntable part. The operating part and the turntable part are rotatable synchronously along a rotation axis line. A first rotating shaft and a second rotating shaft are respectively protruded from two opposite sides of the turntable part along the rotation axis line. An encoder and a push switch are disposed on the circuit board. The first rotating shaft is connected with the encoder. The bracket includes a fulcrum part, an effort part and a load part. The effort part is arranged between the fulcrum part and the load part. The effort part includes a sleeve. The second rotating shaft is accommodated within the sleeve. The load part is contacted with a top side of the push switch.

A sleeve or case for a mobile device, such as a smartphone or tablet or other types of hand-held device or mobile smart device, has a sleeve part for at least partially enclosing the mobile device and an input device arranged in the sleeve part for controlling the mobile device which can be received in the sleeve part. The input device includes a movable control element and a magnetorheological brake. Any movement of the control element can be selectively damped by way of the magnetorheological brake.

A sleeve or case for a mobile device, such as a smartphone or tablet or other types of hand-held device or mobile smart device, has a sleeve part for at least partially enclosing the mobile device and an input device arranged in the sleeve part for controlling the mobile device which can be received in the sleeve part. The input device includes a movable control element and a magnetorheological brake. Any movement of the control element can be selectively damped by way of the magnetorheological brake.