With this small bugging device,you can secretly listen to phone calls and conversations in a room,by a wireless reeeiver from 150m away.The small transmitter with microphone has a very slim design enable it to be easily hidden and it contains a small button battery in it for power. The receiver is a small black box affair with earphone and extra 3.5mm line out for recording to mp3,mp4,tape etc.,The built in rechargable Li-battery can be charged easily through usb cable to computers.
Specification:

Range:Up to 150m
Typical Battery: work for 3 hours

Dimensions:
Transmitter unit:40*35*10mm
Phone unit:40*11*20mm
Receiver unit:96*47*17mm
Accessories:ear phones,usb cable,user manual,charger