With touch wheel and four buttons arranged horizontally below the display
iPod 4G
With click wheel and dock connector
iPod mini
Original 4Gb version doesn't have its capacity engraved on the back and button labels are grey. Second generation 4 and 6Gb versions have capacity engraved on back and button labels match iPod colour. 2nd Generation boasts much longer battery life. All physical dimensions and connectors are identical.