The GoPro Protective Lens for HERO3 / HERO3+ / HERO4 comes in a bundle of two and is compatible with the HERO3, HERO3+, and HERO4 camera models. It fits over the existing GoPro camera lens and guards against dirt, dust and scratches when you're using your GoPro camera outside of its housing or with the optional Frame Mount.

Designed to fit over the regular GoPro HERO3, HERO3+, or HERO4 camera lens
Guards against dirt, dust and scratches while the camera is outside of the housing
Adds protection when handheld shooting with just the camera
Works well with GoPro's optional Frame Mount