2.5mm.

Support : ASUS W1000 (W1), M2400N, M3000N, M6N, Z7100, X50VAveratec 2100, 2200, 3200, 5110, 6200, 7100 Series: 2100, 2200, 3150, 3200, 3220, 3250, 3260, 3300 (E1200), C3500, 5110H, 6200, 6210, 6240, 7100, 7170Clevo: Model 98Compal: ACL 10Compaq Presario: 3000, 3000US, 3005, 3005US, 3008, 3008CL, 3015, 3015CA, 3015US, 3016US, 3017, 3017CL, 3017US, 3019, 3019CL, 3020, 3020US, 3045, 3045US, 3050, 3050US, 3070, 3070US, 3077, 3077WM, 3080, 3080USHP Omnibook: XT1500HP Pavilion: XZ148, XZ168, XZ275, XZ295HP Pavilion ZT Series: ZT1000, ZT1100, ZT1125, ZT1130, ZT1135, ZT1145, ZT1155, ZT1170, ZT1175, ZT1180, ZT1185, ZT1190, ZT1200, ZT1230, ZT1235, ZT1250, ZT1260, ZT1290HyperData: 3000 (M3000N)IBM Thinkpad: I SeriesNEC: VERSA QUA-KW3Packard Bell: iGO6204Sager:Model 98Super Talent: MS1029Toshiba Satellite: 1000, 1005, 3000 & 3005 Series, 1200Twinhead: E14BVPR Matrix: 200A5Winbook: 8080, 8381Westinghouse: NB-14W2* (* The middle prong must be removed)