The QPT-236 portable projector includes a detachable battery with a running time of 3.5 hours. With output of 100 lumens and a maximum projecting range of 152 cm, it is operable with or without battery. Thanks to built-in, 8-GB memory, the device can be instantly operated by users on-site without being linked to a computer. The curved keypad area on the metal surface cleverly defines the functional icons.