3G/4G AT&T with multi-band LTE - Affordable highly-featured, compact cellular router with no WiFi (for secure application) Form Factor: Router ; Technology: LTE Cat. 4 Frequency: LTE: Band 2 , Band 4 , Band 5 , Band 13 , Band 17 3G fallback to HSPA+/UMTS Dim: 117 x 104 x 27 Operating system : Linux/Android