On the front, the phone’s 2.8-inch screen covers the upper half and the alpha-numeric keyboard covers the rest. On the back, there is a big speaker reminiscent of older generation Chinese feature phones that were in demand due to their loud music playback capabilities. In terms of audio output, the speaker is loud but lacks clarity.
Powered by a 1,500 mAh battery, the phone comes with power saving mode, which allows extended usage on a single charge. Like most feature phone, the Detel D1 Slim has a good on-battery time. It works for almost a week on a single charge, when used for attending call and messages. However, playing music on phone speaker brings down on-battery time.