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Great Item! Bought some of these on eBay but here they are even cheaper. Easy to solder, great performance, little price.

This is an awesome sensor! First, has a very very cheap price, second, this sensor can be used in almost every project, in the institute I study Mechatronic engineering and I use it every time because it can sense distance of 3 cm up to 3 mts, can be adaptive to all. Generally I love it.

This item is For Arduino Ultrasonic Module HC-SR04 Distance Transducer Sensor

Im purchase and use This Sensor in Interactive AD at Chilean Subway

This is a great kit for the price but unfortunately the kit came with 3 incorrect parts. Wrong voltage capacitor (too low), wrong polarity output terminals (colours transposed) and incorrect screw size for the heatsink. Also the voltage control works in reverse to normal, turn it clockwise and the output voltage decreases and vice versa, and the on/off switch only disconnects the output voltage but the input supply voltage is still powering the circuit. However in my opinion it's still good value and the incorrect parts issue has been reported and hopefully should be rectified.

Great item with good quality and simple to solder. Very easy to use because is a simple shift register. Great Service too!

I first purchased these on eBay and was very happy with them. A great value. It is a kit and you have to do some soldering with surface mount devices, but I had not problems with this. My only negative comment is that the pin spacing on the two 5 pin connectors, which are used to daisy chain the devices is not placed on a 0.1 inch grid. These pins are about 1.15 inch centers. This makes it difficult to mount these small boards on a motherboard. They were designed to daisy chain together using strapping jumpers, both for the electrical connections as well as physical connections. I have order another 10 and do recommend this product.

These are great. I purchased four and I plan to buy some more. Here's a link to my YouTube video. http://www.youtube.com/watch?v=Hknsb8V3mxc

Purchase it for a trial, better than I would have thought possible. Great updated version of Dot Matrix Module. Easy to weld. Reasonale price and good service!

I purchased it for my DIY robots. Item works well. Well soldered. Fast shipping and good price!