A computer mouse (122, 100, 114, 200, 300, 400, 500, 600, 1400) comprising: a housing (124, 102) comprising an upper portion and a lower portion; a key top (126, 104) provided at the upper portion; a lever member (128, 116, 502) coupled to the lower portion via a joint; a plunger (130, 118, 204); a switch (132, 106, 206) comprising a depressible portion in contact with the lever member (128, 116, 502), the depressible portion being actuated via the lever member (128, 116, 502) and the plunger (130, 118, 204) when the key top (126, 104) is pressed; wherein, when the plunger (130, 118, 204) is depressed, a first distance between the joint and a first point at which the plunger (130, 118, 204) is in contact with the lever member (128, 116, 502) is different from a second distance between the joint and a second point at which the depressible portion is in contact with the lever member (128, 116, 502); wherein the first distance is larger than the second distance; a biasing element (108, 210), the biasing element (108, 210) further comprising a first end and a second end, wherein the first end is coupled to the lever member (128, 116, 502) which is in contact with the depressible portion, and wherein the second end is coupled to the lower portion such that the biasing element (108, 210) is depressed when the plunger (130, 118, 204) is depressed; and characterized in that the biasing element (108, 210) is or comprises a spring and the computer mouse (122, 100, 114, 200, 300, 400, 500, 600, 1400) further comprises: an adjustment mechanism (110, 212, 402) configured to adjust a pretension of the biasing element (108, 210) by compressing or expanding the biasing element (108, 210). a housing (124, 102) comprising an upper portion and a lower portion; a key top (126, 104) provided at the upper portion; a lever member (128, 116, 502) coupled to the lower portion via a joint; a plunger (130, 118, 204); a switch (132, 106, 206) comprising a depressible portion in contact with the lever member (128, 116, 502), the depressible portion being actuated via the lever member (128, 116, 502) and the plunger (130, 118, 204) when the key top (126, 104) is pressed; wherein, when the plunger (130, 118, 204) is depressed, a first distance between the joint and a first point at which the plunger (130, 118, 204) is in contact with the lever member (128, 116, 502) is different from a second distance between the joint and a second point at which the depressible portion is in contact with the lever member (128, 116, 502); wherein the first distance is larger than the second distance; a biasing element (108, 210), the biasing element (108, 210) further comprising a first end and a second end, wherein the first end is coupled to the lever member (128, 116, 502) which is in contact with the depressible portion, and wherein the second end is coupled to the lower portion such that the biasing element (108, 210) is depressed when the plunger (130, 118, 204) is depressed; and characterized in that the biasing element (108, 210) is or comprises a spring and the computer mouse (122, 100, 114, 200, 300, 400, 500, 600, 1400) further comprises: an adjustment mechanism (110, 212, 402) configured to adjust a pretension of the biasing element (108, 210) by compressing or expanding the biasing element (108, 210).