It's a small, usually red, rectangular switch. Sometimes it's labeled "Fuel Pump Cut-off" or has a similar description.
To be certain:
1. Consult your owner's manual: This is the best resource for the precise location in your specific vehicle.
2. Search online: A web search for "[Your Sebring Year] Fuel Pump Inertia Switch Location" should yield diagrams or photos from other Sebring owners.
Remember to disconnect the negative battery terminal before working near electrical components in your vehicle.