I live in Bristol, close to the area where Jo Yeates was recently murdered, and with the hours of light falling squarely within my working day I have no choice but to walk home after dark, even if I never wanted to go to the shops or socialise. I got this alarm to make me feel a bit safer. It's sturdy, fits well in a pocket (being long and thin, rather than short or fat) and makes a massive racket. It also has a handy LED torch for finding the key hole. It's unlikely to stop an axe murderer, but at 150dB it's pretty darn powerful!