The Scouter Drone (偵察機) is a tracking device created by Bulma. It remotely relays a video feed to a monitor through a wireless connection.
Bulma created this device while at Kame House, using what little resources Master Roshi had lying around. She uses it to find Goku, who is going to the Red Ribbon Army Headquarters. Soon, Master Roshi uses it to spy on women on the beach, even spying on a man undressing, by mistake.