... and sd cards are both memory cards,tf cards can be used as sd cards with a sd adapter ... .Functionit is mainly used for cellphone,GPS,Music player,memory disk and etc ... 85centigrade9,Applications:cellphone,gps and digital products with tf cards slots l0,Standardization:comply with SD association standardsWarmly tips1, ... them 2gb 2g micro sd card with sd adapter and retail packing