The Red Box system is an early home automation system designed to integrate with home computers. This system is designed for the BBC Micro. It consists of several different units:

• Red Leader: this unit connects to the user's microcomputer and is a complete microcomputer in its own right. It can control other red units through mains-line networking. An optional real-time clock upgrade is available so it can continue working without a microcomputer attached.
• Red One: this unit can switch a mains socket on or off under control from Red Leader. Maximum load is 13 amps.
• Red Two: this unit contains an infra-red sensor which can detect movement within a range of approximately six metres. Upon detection of movement, a signal is sent to Red Leader.