It gets even better. According to GoPass' website, the GPS-911 "Personal & Vehicle Tracker" boasts the following impressive capabilities:

‧ GSM/GPRS module
‧ SiRF Star III GPS chipset
‧ Quad bands (850/ 900 /1800/ 1900 MHz)
‧ Supports GSM/SMS/GPRS communication
‧ Pocket-size for personal & vehicle tracking
‧ Report the position at a preset time interval
‧ Built-in omni-direction GPS & GSM antenna
‧ Locate and track your loved ones all the time
‧ Geo-fence function for child or car's security
‧ Available for bi-directional phone conversation
‧ SOS function to summon help to the exact spot
‧ Monitor the sound/ conversation live & real-time
‧ Dedicated application software for DIY tracking
‧ PC track, NB track, or PDA track 3-in-1 DIY tracking
‧ Built-in speaker, mic & removable re-charged battery
‧ No monthly service charges to be paid to the call center
‧ Any navigation map or Google Maps can be used for tracking

As far as I can tell, the only real downside is the 8 hour battery life, and the requirement for a GPRS data-enabled SIM card with a valid carrier plan. Well, that and GoPass' totally shady Taiwanese website that makes me think thing will never see the light of day. No pricing or purchasing information is mentioned on GoPass' site, but it looks like the street price is around $500.