Just think about it for a second. What powers the LEDs? Your transmit power (you know, the small number of watts a handheld puts out while transmitting). That 4 watts of transmit power being sent out to that very inefficient rubber ducky giving you pretty short range already now is reduced even more powering the "cool" lights. Your friend may now hear your voice better without the HT once you start using one of these.I wonder how well these work?
You forgot it's undocumented with the antenna because it's a feature already built into the radioThe vibrate function is an undocumented feature.