This collar has a much louder warning signal, and vibrates at the same time. So far, it has worked well. Our dog had escaped when using the regular collar, but so far with this collar, no escapes have been attempted.
After losing our female scottie in a vehicular accident outside our home, we purchased one of the RF-275 as a test and put it on our our male scottie (yes he is above 30 lbs) and have set it on level 2. The RF-275 has worked perfectly for our little boy. The added feature of vibration has really kept him away from the boundary lines. The fact that it is water proof is a great plus as he has found that jumping into the koi pond is great fun. Great product A++