... cards are both memory cards,tf cards can be used as sd cards with a sd adapter.Functionit is mainly used ... device,its size is 15mm x 11mm x1mm ,similar size as a fingernail,current capacity: 128MB,256MB,512MB,1G,2G,4G ... there are nude cards,cards with small white box package,retail blister package,4,there are cards without brands(neutral cards ... them 2gb 2g micro sd card with sd adapter and retail packing