Where Star Trek’s communicator may have predicted the cell phone, Space: 1999 predicted today’s PDA/cell phone combination machines: the commlock was the connection between individual users and the central computer system on Moonbase Alpha. 

The commlock allowed video-phone communications, while simultaneously providing wireless connection to the network computers within the moon facility and within the Eagle transport spacecraft.  In other words, it was a cameraphone/internet device.

The Space: 1999 stun pistol was also a vital prop throughout the series.  For a sci-fi hand weapon, it is based on a totally unconventional design (in fact, it appeared to be modeled after a staple gun).

In prop design, Space: 1999 literally did for television what Star Wars did for the motion picture industry.  It set a new standard that all others had to meet.

The EVA suit: