Old Oral-B great, this one not so much (Oral-B 4000) [SEP] I had an older oral b electric toothbrush (5000 model) that lasted me a good few years. The battery in it started dying after a few brushes and the toothbrush was looking old so I thought it was time to get a new one. I purchased the 4000 model because I didn't really need the timer of the 5000 model and it looked very similar. It's not as great though. I don't know if I just have a defective one or what but the &#34;brushing too hard&#34; red light is constantly going off when the tooth brush is on, even when it's not in my mouth!<br /><br />As to the rebate, I don't buy things just because there is a good deal going on but if I happen to find a deal for something I'm planning to buy, I will normally use it. I purchased this item which came in the Amazon Frustration-Free packaging. Sent in the rebate form, receipt, and the original UPC bar code (just like the rebate form showed), and I too got a letter stating they have not received the UPC code and to send it in.