Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to have a radar detector installed [title] Consider a remote mounted detector. [substeps] Remote mounted radar detectors are typically more expensive than the traditional units that are mounted on dashboards. These radar detectors are more difficult to detect if you're in a place where they are illegal as the detector unit is usually mounted inside the dashboard.

Ending1: Remote mounted radar devices generally all operate at 300 feet (97.7 m) for approximately 24 hours. There are military-grade radar devices that are licensed to operate night. Ending2: [title] Always have your radar detector on board with you at all times. [substeps] If you have a remote mounted detector detector, then keep it at all times. Ending3: [title] Ensure that the radar unit will not transmit sound. [step] If the radar unit does transmit sound, it is generally electromagnetic. Ending4: This unit is also not visible to thieves. Remote mounted radar detectors should always be installed by a professional as the unit will need to be placed inside the dash.

Answer format: ending1/ending2/ending3/ending4