The present disclosure provides a device for increasing performance, comfort and/or preventing injury of a user of a computer mouse or the like. The device comprises a wrist support (20), having an upper side (21 ) adapted for receiving the user’s wrist and/or lower forearm and an underside (22) adapted to bear against a planar surface, such as a table, wherein the underside (22) presents a bearing arrangement (121 a, 121b, 121 c, 121 d, 121e) for reducing friction against the planar surface, and a hand support (20), adapted for receiving a part of the user’s hand. The hand support (20) is horizontally /- 40 degrees, preferably /- 20 degrees or /- 10 degrees, movable relative to the wrist support (10).
