The PowerLink® 3 control unit gives students the ability to control most electric appliances, tools and toys with single switches. PowerLink 3 control unit also gives students the power to take turns operating devices, activate two devices in sequence or experience the freedom of choice making when deciding between two activities. Four modes of control, including Direct, Latch, Timed Seconds and Timed Minutes let you choose the amount of time the activity requires to ensure student success.