You can connect the E5577-320 with the USB interface of a computer, or connect the E5577-320 with the Wi-Fi. In the service area of the LTE FDD/LTE TDD/DC-HSPA+/HSPA+/HSPA/UMTS network, you can surf the Internet and send/receive messages/emails cordlessly. The E5577-320 is fast, reliable, and easy to operate. Thus, mobile users can experience many new features and services with the E5577-320. Form: LTE Mobile Wi-Fi Communication System: LTE / UMTS / GSM Speed: LTE 150 Mbps DL / 50 Mbps UL microSD card slot: Standard microSD card interface Wi-Fi Protocol: 2 x 2 802.11b/g/n Battery: 1500 mAh 4G LTE Band: B1/B3/B7/B8/B20/B28/B38/B40/B41