Led lights

I am surprised ebay works so well. It's system of ratings and comments is very important. I was disappointed only once in many purchases ranging from a camera through China LEDs and a battery monitor that only monitored discharging, not charging. I expressed my disappointment with 3 stars of 5 and a comment simply that it didn't monitor charging. Immediately I got email from the seller begging for 5 stars, as they are for the retailing not the product. I got a full refund and was excused from mailing the useless monitor back in return for the stars. I left the comment as was.