We have had nothing but success in using this dog collar for our dog (40lbs mix) The collar is adjustable and the battery lasts much longer than expected. The remote control is easy to use, a little bit larger than expected, but seems to fit in my husband's pocket just fine. After the first use (using only the vibration setting) our dog came right back inside (his problem was running out the door into the neighborhood). We give this product 5 stars and recommend it to other dog owners.