I work in the real estate business which requires alot of driving and need a good bluetooth headset that can work for long periods on the road. I already have a Plantronics 640E headset that works while I walk around the office, but I specifically bought it for use while driving which it runs low on power immediately after a few minutes on the road after a full charge. I thought that it was defective so I exchanged it twice for the same model at the store and both new units had the same problem. My ideal headset would be one that works good while driving, slim/sleek, good sound quality, call/answer & volume buttons on the unit itself, any suggestions? I don't know if it matters but I use a sprint samsung SPH-A900. Thanks for your suggestions.