ReFuel 2-Pack Battery for GoPro Hero4 Scientists have Observing Reaction for

Scientists have Observing Reaction for Years

It is secured firmly in place with the included Allen wrench

The RAM X-Grip® has a clean and clever four leg design that sports great holding power without hiding your phone behind foam pads and plastic

you can install/swap any color filter like red

Flip between any 2 filters on the same dive with the touch of a finger

ReFuel 2-Pack Battery for GoPro Hero4 Scientists have Observing Reaction forReFuel's dual battery pack for the GoPro Hero4 Black and Silver Editions. Amazing run time on these replacement batteries for less money. You get two 90 minute rechargeable batteries that replaces the AHDBT 401 battery that comes standard. These batteries are 100% compatible with the GoPro Hero4 action cameras. Premium lithium ion cell battery.