These are the best value bluetooth headphone/sunglass combination on the market today.1. Battery Life: 7-9 hours2. Sound Quality : 7 out of 103. Connectivity: 10 out of 104. Water Resistance: 8 out of 105. Controls: 7 out of 106. Lifespan: 9 out of 107. Safety factor: 10 out of 108. Flexibility in use: 10 out of 10Sound Quality is good based on the driver size and excellent based on the price and intended use.Connectivity takes less than 10 seconds. Turn it on the first time, select it in your phones bluetooth settings and you are done. Use it till it dies.I sweat a ton when I run and these get soaked. I also run in the rain and these work without issue. If I were to rate it by the IP Code, I would rate it an IP 5 to IP6. It probably would not survive immersion.Controls are on the right side. Short press center button - play/pause answer/hangup Long press center button - power on/off or reset/pair Long press top or bottom buttons, volume up/down Short press top or bottom buttons, skip forward/backI get about 2 years out of these glasses but I use them heavily, especially when running. At $10 per year, that is an exceptional value.Safety factor? What? You have to be careful when running or riding on the road. You can pull the ear buds out and away from your ears, still hear your audio and easily hear traffic around you. The buttons are far enough apart that you can skip, pause, answer, hangup and adjust your volume without taking your eyes off the road.Flexibility? The lenses are on a pivot and allow you to flip them up. This is good when you are sweating and need to cool your eyes or when the sun goes down. I run at night and use the clear lenses at night.The ear buds are on an extendable tube which gives about a centimeter of adjustability. The charging port is under one of these tubes.For less than $20,these rock. If you have a small face, the ear buds may be a bit to far back for a snug fit.