Fat Shark Trinity head tracker for HDO2 is the epic result of pairing an accurate 9DFO IMU with a revolutionary new vector algorithm that anticipates and maps real head motion in free space. Trinity delivers the smoothest and most accurate 3 axis head tracker ever; it is impossible to even imagine what could be improved as the performance is flawless. Rapid flui16-bit motion, zero error – the head tracker is so natural that it becomes an extension of your environment and you soon forget you are even using one. Trinity head tracker is a quantum leap forward in head tracking performance and will change how FPV pilots fly HDO2. Note: Requires disassembly of your goggles and a high level of competency - we recommend that you have your local authorized service agent perform any work required on your FatShark HDO2 goggles Disassembly of your goggles will void your warranty unless performed by an authorized service agent. Deletes the power button and replaces it with a PS/2 port for head tracking.Does not include cables.