USB keychain 1) very convenient 2) USB 2.0 3) best service 1.USB keychain2.Capacities:1GB,2GB,4GB,8GB,16GB,32GB.6000KB/S3.Operating temperature:0°-60°C / 32°-140°F4.Storage temperature:20°-85°C / -4°-185°F5.Convenient pocket,easy for transportability6.No USB cap to be lost USB keychain