Yes it looks like a very dangerous device, but it makes a excellent wall bug, drill a very thin hole in the wall, insert the needle and listen in using a uhf receiver.

Size 66×27×14mm

Power sourceAA batteries

Distance 300 meters (line of sight)

Frequency A, B, C

Receiver 3-CHANNEL UHF MINI RECEIVER

Please note that this is the bug ONLY you will need to purchase the UHF 3 channel mini Receiver to pick up the transmission.