Battery or power management icon, black battery with a green level indicator and a white power cord. Get a layered PSD source.
Knowledge icon in PSD format. Books with a red apple on top of it and an old lamp, a simple education symbol.
Chemistry icon (PSD), two science flasks with a blue and green liquids, science experiment graphic, get layered PSD.
1 and 0 power switch, black color graphic with a red and green switch position illumination. Get in layered PSD format.
Flashlight icon in PSD format. Modern looking gadget with a yellow beam of light, black body color with a glossy finish.