I bought this back-to-the-past Zaku II Stereo Head Speaker, seriously not for the speaker function but as a timeless display item for my Zeon theme corner. Powered by two AA batteries, the speaker contacts to music devices by cable. Can hide the cable by coiling it around the short neck of Zaku. The technology of this mono-eyed speaker is way obsoleted taking consideration that it was released back in 2008. Current technology of mini speaker has reached the stage whereby it can be charged by USB cable and connected to devices by Bluetooth. The Zaku II is about 9cm in height and taller when attached to an optional leader antenna. Produced by Banpresto, Gundam Zaku Head Speaker was manned to be a lucky draw prize back in 2008 @ amusement arcade. Sieg Zeon!