From the GridTalkie web site: “The GridTalkie system allows you to communicate in real time anywhere in Second Life between friends. It works like a walkie-talkie or IRC client. It is a suitable alternative to Group IM (which can fail horribly, takes time to set up, can’t invite new users, etc) and an affordable solution for keeping in touch with your friends, anywhere in the grid.”
This device is excellent for role play groups where group conversation is required, such as security enforcement or military groups. It is extensively used by the SLCG and Flying Tigers groups.
Hat tip to Elisha Paklena and the SL Coast Guard for the lead.