radio frequency

Emergency-focused models commonly include NOAA weather reception, built-in LED flashlights and reading lights, SOS alarms or sirens, and SOS flashing lights for signaling.

Run times vary by model and function. For example, one emergency model lists radio listening at medium volume for at least 42 hours and reading-lamp/flashlight runtimes of at least 20 hours after a full charge; another model lists about 20 hours for the flashlight and about 12 hours of Bluetooth/TF playback at medium volume.

Some emergency models specify FM coverage of 87–108 MHz and AM coverage of 520–1710 kHz. Certain models also list NOAA/weather band (WB) channels around 162.400–162.550 MHz and include shortwave (SW) ranges where supported.

Common wired inputs include 3.5 mm headphone/aux jacks and auxiliary line-in. Some units offer Bluetooth wireless audio and micro SD/TF card playback where specified.

A few emergency models are described as water-resistant and some list an IPX3 rating; however, many listings do not specify any water-resistance or IP rating in the available details.