This type, DGWE3C-xx (or DJxx) 3-component borehole geophone, is a kind of electrodynamics velocity sensor, generally used to receive seismic wave borehole. The geophone is made up from 3 orthogonal high-sensitivity units, which can sense the seismic wave from the 3-directions respectively. It uses the reed-type and electromagnetic sidewall pad device, being to suit for drilling well of a diameter of Φ60～Φ160 (the maximal diameter is up toΦ200 by adjusting the position of a screw). There are two kind of cable, 60m  and 120m with the Φ3mm wire rope. 

The working efficiency and receiving result have an advantage over the battery device. According to requirements of users, leading-out end of the cable is 27 cores plugs or three pullers that are red, yellow and blue respectively.

When the 27 cores plugs are welded, the leading-out end 1 and 2 are vertical components, and 3, 4, 5 and 6 are horizontal components, which odd number denotes positive and even number denotes negative. When three pullers are welded, red is vertical component and others are horizontal components, which the width denotes positive and the narrow denotes negative.