SONY Memory Stick PRO DUO (Mark 2) Memory Card 4 GB 4GB 4 Gig for Digital Camera SONY Cybershot Cyber-Shot/Alpha Series Memory Card Type: Sony Memory Stick PRO DUO (Mark 2) Memory Card Capacity: 4GB Write Speed: 32Mbps (minimum)(When combined with optimized Memory Stick PRO format-compatible devices) Ideal for AVCHD recording Dimensions: 1.6mm Height x 20mm Width x 31mm Length