I recently purchased the Roav Smart Car Charger F2. The listed frequency range in the data sheet is 87.5 - 108 MHz.(https://cdn.shopify.com/s/files/1/1517/5210/files/Smart_Car_Charger_F2_R5111_EU_Manual.pdf?3419059451899906623)
I can't tune it below 88.1 MHz with the app or built-in controls...