The device uses a fair amount of power. 2 different laptops just managed a red flicker when asked to charge the flat battery. PC shows flickering red alternating with blue when recording. All OK on powered hub built into monitor. A 1 Amp current limited supply shows red alternating blue when recording with screen on, with a battery fully charged whilst device is "off". Thus 1 amp is being boosted by the internal battery. A few minutes after the screen shuts down, the red led no longer shows, so the current drawn whilst just recording (video+audio) is somewhere around 1 Amp.