A relatively small black and silver colored Citizens Band radio, model 13-775B from Midland International features a built-in telescoping antenna and a six-channel tuner (out of 40 total CB chs).
This CB is rectangle-shaped and may be used with a specially designed fit-over case. As with many CBs, the front panel has a channel selection knob, a volume control, and a squelch control.
CBTricks.com has a schematic (PDF or JPEG) and a manual (PDF) for the 13-775B. The manual requires PDF reader software (like Adobe Reader). Midland also makes VHF, Ham, and Weather radio equipment.