The back of the base has a kill switch for the electronics, also a micro USB charger for the lithium ion battery in the base.
The T-800 eyes can be turned on using the chrome remote control that has a CPU chip keyring.
Also a shot from behind the bust.
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Excellent work on the bust. Could you show how you set up the rechargeable lithium ion battery and remote please? I just set up a 3D printed endo, and I would like to install red LEDs for the eyes without taking the head apart to change batteries. Having a remote is a great idea.