I liked the no installation feature of this unit. Just charge it, synchronize the Blue Tooth function with your cellular phone and you were off and driving down the road with no installation costs or down time.The unit was fully operational for the first 3-weeks. It worked very nicely during hands free usage. However, during the third week the on/off switch, which is built into the slide out microphone, would not stay retracted in the off position. As the microphone was slid in to turn off the device, you could feel the catch click but the microphone would not stay in the retracted off position.I contacted the manufacturer service representative and was provided with swift service re returning the unit. I am awaiting the arrival of the new unit to see if I experience the same problem. If this occurs a second time, I will be looking for a different hands free unit to purchase.