ZyXEL MWR211 802.11n Battery Powered Mobile Wireless Router, 3G/4G ready Always-on Internet - Support for 3G / 4G Internet access as either the primary or backup WAN connection Portable Router / Use Anywhere - Battery allows for up to 2 hours operation or 4 hours standby Blazing Fast Wireless - Wireless N compatible with connection rates up to 150 Mbps Innovative Data Usage Metering System sends alert via email when usage is approaching allowance