A4 Tech PC Computer Mouse Model AM-5 Vintage 3 Button Wired w/Box - TestedTested, working and in very good condition.A4 Tech AM-5 is a classic 3-button, wired mechanical mouse originally released in the 1990s. It uses a classic RS-232 9-pin serial connection and supports Microsoft Serial & PC Mouse compatibility. Can be used with USB port if USB 2.0 to serial DB9 Male cable adapter is used (not included).