Conforming to the SSFDC forum proposal for SmartMedia miniature storage media, MCR102 series of thin SmartMedia SMT connectors comes in three types: a 3.3Vcard type, a 5V type, and a combined 3.3V and 5V type. A mechanism prevents insertion of the wrong type of voltage card. These low-profile SMT connectors are 40 mm long x 38.5 mm wide x 3 mm high (excluding the card insertion slot). The covers are designed to make connection with the ground of the board. Insertion and withdrawal life is 10,000 cycles.