1. Orignal 2. Transfering music from Mobile to Audio, commonly used for car, home ect 3. Avabile Models: MMC30 for Sony Ericsson: K300, K500, K600, K700, P900, P910, S700, T290, Z500 etc MMC50 for Siemens A51, A53, A62, CX75, M75, S75, SFG75, SG75, SL75, SP65, SX1, U15, U10, SL45 etc MMC60 for Sony Ericsson K750, D750i, W600, W800 etc MMC70 for Motorola Q, Roka E1, U6, V1050, V235, V3, V501, V557, V660, V710, V820, V820P, A1010, A1200, A630, A728, A732, A768, A780, A845, A860, A920, A925, C261, C380, C650, C975, E1000, E1070, E1120, E398, E550, E680, E685, E895 etc MMC75 for Motorola V3i, U6, L7 etc MMC80 for Samsung D500, E640, E730, E350, E600, D340, E800, E720, Z300, E530, E560, E880 etc MMC 85 for samsung D800, D820, D520 etc MMC90 for Nokia 3100, 3120, 3200, 3220, 3230, 5100, 5140, 5140i, 6020, 6021, 6100, 6101, 6270, 6280, 6610, 6610i, 6630, 6660, 6670, 6680, 6681, 8800, 6810, 6820, 6822, 7200, 7210, 7250, 7250i, 7260, 7270, 7800, 7610, 7710, 9300, 9500, N90, 7360, 3250, E60, E61, E70, 7370, N80, N71, N92 etc MMC95 For Nokia 5200, 5300, N91, 7390, 6708 etc