© Franzis Verlag

With this box, any tinkerer can build a powerful listening device in just a few steps without soldering, which can be used to amplify quiet noises in the environment - for example animal sounds. The instructions clearly guide you through the assembly process and no previous knowledge is required. In addition to a pre-assembled circuit board, a housing, sound transducer, search coil, rotary knob, ring nut, washer and battery clip are also included. You will also need a 9 V block battery, glue, adhesive tape and an empty yogurt pot.