I purchased these chargers to use with MP3 players, not a Blackberry unit. Both units work well and charge quicker and easier than using a computer. The travel adapter works better than the car charger. The car charger has to be placed in the lighter unit "just so" or the unit will not charge. Once in the lighter unit correctly, the charger works fine. The price of these units is excellent - at some retail stores, one charger will cost $15-$20. Both of these chargers sold as a set for under $****.