小型和大型圓形發射器彈簧（2件組）

The set of two is exactly what I needed for both my small and large transmitters, and they fit snugly without any wobble. Installation took me under five minutes, so no frustration there. Solid purchase for the price.

These springs finally let me swap transmitters without wrestling with the battery door every time, and the set of two means I've got a spare. The tension feels just right for both my small and large round units.

The fit is perfect on both my small and large round transmitters, and having a set of two means I always have a backup ready. These springs feel solid and click in securely, which gives me peace of mind during setup.