Simply put, it’s a small device which allows you to use 3.5G HSDPA mobile internet access on your computer via USB. Most cell networks support 3G these days but if high-speed data network is unavailable, it will switch down to slower GPRS access.
Quite surprisingly, the device worked well whilst driving around the mountains albeit dropping out occasionally, as it changed phone towers or as we drove through tunnels. The real test however, would be if it worked while traveling at up to 300km/h (about 187 miles / hour). It only claims to work at up to around 150km/h, which is faster than most situations where this device would be used. What happens though when we fire it up on Taiwan’s new High Speed Rail trains which burn their engines at up to 300km/h?