This is a Nice little Charger it works great at charging my android phone and my Plantronics battery pack/headset. It has a Nice sleek design and it's quiet no humm or high pitched noises, and charges very well no uneven charging that i can tell.  I would suggest to anyone that need at least two items charged at one time, But I would expect super fast charging either since both outlets would be in use.I use this in my new KIA Rio that turns off the cigarette lighter/accessories outlets when key is turned off, I don't think the charger would drain your battery, unless you forget it over night.I have NO Problems with this Charger, It works with all USB related Items I have tried that use USB connected charging Port. 

Question: How is the design of the headphones?
Answer: Nice sleek design