Franzis Make your own Bat Detector Kit & Manual Hardcover – January 1, 1875

Works as expected!I purchased a new item from a third party seller, and as indicated, the kit contains a circuit board and other necessary components. The only thing you need to add is a 9V battery (a soldering iron, pliers, wire stripper, wire cutters, and a screwdriver are necessary to assemble the kit, and some glue or hot melt glue is helpful to hold the microphone down).The kit is pretty easy to assemble if you are comfortable soldering stuff, and the instruction manual is in both English and German. The manual includes a few experiments/suggestions for different ultrasound sources to listen to.The circuit appears to use a heterodyne detection system, so you will need to optimize the local oscillator frequency (with the frequency knob) to listen to different sources.

You need solder, wire cutters, a small flathead screwdriver, a 9V battery, and a soldering station. Assembly took about an hour (I wasn't particularly rushed).All electronic components are included; they seem to be of decent quality. The cardboard box itself serves as the housing--meh. Pro: good quality, thick/stiff cardboard. Con: it's still cardboard.The booklet was excellent. It contained solid assembly instructions with a mix of both electronic and bat theory. I wasn't expecting much at all, so my expectations were exceeded.Soldering wasn't particularly hard, but I wouldn't recommend it as an absolute beginner. There's an 8 pin IC that you need to solder--not bad but might be a bit intimidating for someone with no experience.Best part: it worked! I took it to the park and hung out by a tree that I knew had bats; it definitely enhanced my bat-watching experience. But I'm uncertain if I could have found bats if I hadn't known where to look.Great value for money spent: novelty, education, and sharing enthusiasm for science with my kids.

Haven't used it for bat's yet, still too cold. It works great for testing dog whistles and dog bark detergents. The range is from 20 to 40 kHz. Will try to find more uses as I go but for now it keeps the Grandkids entertained.

This is a great little kit. The housing is a card stock box, with a circuit board, and loose capacitors, a resistor, and an IC chip to be soldered together. There are also knobs and rheostats for volume and frequency. The instructions are very clear and if you have experience in soldering it should only take under an hour to put together. It does work well in detecting ultrasonic sounds from 20 khz to 100 khz.

This works great , Kit directions were very clear, detected a bat the first evening ,Highest quality kit I've encountered , works as described , Highly recomendedGary

Instructions were great, soldering took a little longer than expected, but it worked first try. Bats are gone now, but the detector "hears" lots of things, Rice Krispies, induction cooktop, fluorescent lights, etc.

what fun--bat detectors are a fortune, and for a bit of fiddly soldering, we now have one. we added a velcro keeper for the battery, which was rattling around and we did not want it to break any of the contacts loose.

Doesn't work