With this GSM wireless voice listening adapter, the location can be searched from anywhere in the world by monitor, computer via smartphone, and location trajectory. It has a voice-activated call-back function, real-time target listening, real-time target location lock, and a GPRS tracker. These devices can be set up in desired places such as bedrooms, living rooms, conference rooms, or offices. Recording can be checked by computer with a GSM card. It supports charging during recording and the result can be better when charging. Also, it is powered by a battery or power outlet.