A corded landline phone with a narrow profile and wall-mountable option. The outer casing of the handset and base are made from translucent red and white plastic enabling viewing of the internal electrical components. It has a pushbutton keypad in the handset with dual number and letter functions for each key and also has redial, recall, reset, asterisk and hashtag buttons. The base has a lined list numbered 1-10 where phone numbers could be written. The Telstra logo and "Slimline 20" is at the top of the list. The ringer volume is controlled by a slide button on the underside of the base: HI-LO-OFF. There are also 4 small round rubber feet on the underside. The red coiled cord between the handset and base can extend to approx.1500mm. A small Telstra logo has been printed in white on top of the handset.

A label affixed to the underside of the base reads: "Model No.:TP20/REN=1.0/0J/Made in China N778". On this label there is also a triangle with rounded corners and a tick symbol inside it.