This new wall listeing device has a high sound sensitivity, equipped with headphones, improving the sound quality. Can be used for wooden walls, doors, , steel plates, floor, pipeline, etc. Easy to use, just close to doors, or walls, and listen to all sounds easily in . You can adjust the volume slowly, hear a clear sound, and ' cause discomfort to your ear. It can be used anywhere, and has a built-in lithium battery, convenient to use and carry. Battery Capacity:180mAh Colour:black Material:plastic Package Contents: 1 x leak detector 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.