This product is part of the Harmony GTO range, an offer of memory cards for HMI panels. The SD memory card has 4GB capacity. The speed class is class 4 which support 4Mbps of minimum sequential writing speed. This product is compatible with Harmony GTO touch screens, HMIGTO1300, HMIGTO1310, HMIGTO2300, HMIGTO2310, HMIGTO2315, HMIGTO3510, HMIGTO4310, HMIGTO5310, HMIGTO5315, HMIGTO6310 and HMIGTO6315.