Brand Name: TRANSCEND Model No: 25H3 Weight 4TB: 308g (10.86 oz) Operating Voltage: USB DC 5V Storage Media: 2.5"SATA HDD Certificates: CE, FCC, BSMI Connection Interface: USB2.0/3.0 Power Saving Mode: 10 mins One-Touch Backup: Yes Durable anti-shock rubber outer case Size 4TB: 131.8mm×80.8mm×24.5mm (5.27"x3.23"x0.98") Operating Temperature: 5°C(41°F)~55°C(131°F) Advanced 3-stage shock protection system Advanced internal hard drive suspension system Three Year Warranty