Our lightweight and portable (5.75 X 2.25 X 1.0 in) Geophone is a perfect accessory to an existing tracker's tool kit. Small enough to fit into a shirt pocket, it has exceptional performance with very high gain and low noise operation, along with immunity to power line and radio frequency interference.
The Geophone can be purchased separately, but it usually comes with a geophone probe and 50 ft. cable. A high performance Sony studio quality set of headphones and a 6 ft. audio cable to connect to vehicle audio inputs are provided as well.
One of the Geophone's really nice fieldwork features is its quick change-out battery compartment. Simply pull on the black rear bezel and the battery holder slides out and the four AAA cells can be replaced in seconds. Push back the compartment and it snaps into place. No need for a screwdriver or any screws to undo.