New Apple iPod Classic 6th & 7th Generation Periwinkle Metal / Grey / Periwinkle Metal (Aqua) Click Wheel (Crystal) You could cut off some

You could cut off some of the excess PCB with a scissors or wire cutters on variations that are said not to fit to make them fit

Battery is compatible with both WiFi only and cellular models

Bluetooth 5

MA850G/A or MA850G/B: NO inline controls / microphone

as many of your questions are likely answered there

New Apple iPod Classic 6th & 7th Generation Periwinkle Metal / Grey / Periwinkle Metal (Aqua) Click Wheel (Crystal) You could cut off some128GB 256GB 512GB 1TB iPods are upgraded with SD card storage using Tarkans iFlash Solo, Dual & Quad adapters. Please note: 120GB & 128GB iPods are a mix of 6th & 7th Generation logic boards. If you prefer one over the other, please include it in your note. All iPods come with a new USB charge sync cable! Limited Warranty Information & FAQ Access Here