
At $66, the Carlinkit 5.0 (2air) is the one we'd buy. It plugs into your car's existing wired CarPlay or Android Auto port and converts both to wireless, and Carlinkit documents the specifics that matter for a stable connection: dual-band 2.4 GHz + 5 GHz Wi-Fi (a Broadcom BCM8335 module on an Atmel processor), automatic reconnection after the first pairing, and both USB-A-to-C and USB-C-to-C cables in the box so it fits different car ports. It is rated for iPhone on iOS 10 and later and Android 11 and later. Who should NOT buy it: if your car doesn't already have factory wired CarPlay or Android Auto, this won't add it — it only makes an existing wired system wireless — and if saving about $10 matters more to you than a documented spec sheet, the $55.99 4.0 is the cheaper option.