This is a 40mm ProTek R/C Power Cord Adapter, intended for use with SkyZone and Fat Shark Goggles. This adapter features a male 5.5mm barrel plug on one end and a female JST plug on the other. This adapter allows a JST Plug equipped battery back to power SkyZone or Fat Shark FPV Goggles.

Recommended Battery:

• ECP-4002: EcoPower "Electron" 2S Li-Poly 20C Battery Pack (7.4V/850mAh)
• ECP-4009: EcoPower "Electron" 2S Li-Poly 20C Battery Pack (7.4V/1000mAh)

ProTek R/C is an AMain Sports & Hobbies brand.