The TCL One Touch 4021 is a user-friendly mobile phone with a 4.6 cm (1.8 inch) display. It supports 2G networks and features a rear camera, 4 MB RAM, and 4 MB ROM. The phone is powered by a 1030 mAh battery and includes Bluetooth, Dual SIM capability, a 3.5 mm audio port, and a torch. This particular variant is in Dark Night Grey and has a storage capacity of 4 TB. It operates on 2G mobile network generation and has a battery capacity of 1030 mAh.