Works and does what it promises. ARB outsourced their manufacturing to China, and now you can find the exact same device without ARB's branded case and watch face. The first came with rubbed brass and I sent it back, the second also came with rubbed brass as if it had been assembled at the factory with pliers. I ended up letting it sit because I didn't have time to return it and buy something else. It's worked fine for the last year, but it's still a shame I overpaid for a cheap Chinese product with the ARB logo.