LED 4 Bits Display Module TM1637
Having a text display in a system is good, but it is better if you have a display that is made, especially for the time.
This module uses TM1637 driver to drive four standard anode tubes. It also has a clock point (":"), so it quickly displays the time.
Connection to this module only needs 2 digital pins as well as its power supply of 5V(VCC/GND).
Together with an RTC, you could make a digital clock out of this module.