Motion sensor

A Wattz Electronics C-U model motion sensor, or simply motion sensor is a miscellaneous item in Fallout and Fallout 2.

Characteristics
The motion sensor is a computer auxiliary that detects the movement of biological material over a distance of meters using a tuned radar device.

If placed in an active item slot, the motion sensor can be used in conjunction with the Pip-Boy 2000 AutoMap feature. The motion sensor will display all living and moving beings on the map - represented as red dots - if the "Scanner" button under the AutoMap is clicked. The C-U model is only compatible to the PIP-Boy 2000 or earlier models; the PIP-Boys Vault City is equipped with are too advanced to use this auxiliary.

In Fallout 2, carrying a motion sensor in your inventory gives you a 20% bonus to the Outdoorsman skill when traveling on the world map. It's battery life is displayed in the Interface bar's ammo meter.

Fallout

 * It may be sold by Killian Darkwater in Junktown, the Shopkeeper in the Cathedral or at the General Store in the Hub.
 * One is found in the Unusual Call Box special encounter.

Fallout 2

 * One can be received as a reward for Vault City quest; Enter NCR and return to Stark.
 * The Armorer in the Navarro Enclave base has one, but you must kill him to get it.
 * One can be found on the second floor of Vault 8 in the small locker behind locked door.