The Polar Pro Red Dive Filter fits the lens port of the GoPro Dive Housing and is designed to ensure the GoPro retains proper white balance in blue or tropical waters‎.‎ This polycarbonate/Lexan filter is recommended for depths between 10 and 80‎'‎‎.‎ It can be used with the Dive Housing for the HERO3‎,‎ HERO3+‎,‎ and HERO4‎.‎The filter is built into a slim frame that snaps on and off the lens port of the GoPro‎'‎s underwater housing‎.‎ It features a tether cord to help you avoid losing the filter while diving and a scratch‎-resistant microfiber pouch to store it in‎.‎