Don?t buy this rack Im so incredibly disappointed! I went from using 3 outlets a night to 1. Short return-window has already passed, so I guess this $20 paperweights going in the trash . Thus, when my husband requested a pair of over-the-ear headphones for his birthday this past November, I knew what I wanted to purchase. 5 and 40 in Birkenstock?s. What else can I say! Its not necessarily easy to install the first time as I wanted to make sure the spacing was good for my kayaks. they are very comfortable and cozy to wear. The bottom charger is QI wireless charger for Air pods or other QI enabled wireless devices.