The Apple iPod mini (Second Generation), is similar to the original iPod mini, but the second generation models use richer, deeper shades of four of the original colors -- silver, blue, green, and pink (with gold no longer available), the pressure sensitive "ClickWheel" navigation buttons are color-matched to the housing (these were gray on the original iPod mini regardless of housing color), boost battery life to 18 hours (up from an impressive, at the time of introduction, 8 hours for the original), provided the option of a larger capacity hard drive (6 GB), no longer shipped with a Firewire cable or an AC adapter, and started at a lower price (US$199).

Like the original iPod mini, the second generation models use a compact 3.6 by 2.0 by 0.5 inch lightweight anodized aluminum case with a 1.67 inch (diagonal) grayscale LCD display with LED backlight and navigation is performed with a "ClickWheel". Apple advertised that the 4 GB configurations are capable of holding approximately 1,000 songs encoded in "128-Kbps AAC format", and the 6 GB configurations, 1,500 songs in the same encoding.

Battery life is estimated at 18 hours of music playback and it provides 25 minutes of skip protection.

Despite the age of this device, site sponsor OWC has inexpensive, compatible headphones and some upgrades and parts for vintage iPods while supplies last.
https://everymac.com/systems/apple/ipod/specs/ipod_mini_2g.html