... downlink, HSUPA up to 5.76Mbps uplink ZTE MF668 HSUPA USB modem Weight: 30 grams Size: 7.7 x 2.8 x ... 21Mbps downlink, HSUPA up to 5.76Mbps uplink Interface Type: USB 2.0 Operating Systems Supported: Windows 2000, XP, Vista, Mac ... with memory storage capability up to 8GB Small and compact USB form-factor with integrated antenna ZTE MF668 HSUPA USB modem