Motion sensor
From A KoL Wiki
This little wrist-mounted beep-booper will make it harder for enemies to sneak up on you, unless they're in the vents.
Type: accessory
Cannot be traded or discarded
Quest ItemCombat Initiative +100%
NOTE: You may not equip more than one of these at a time.
(In-game plural not known - if you know it, please add it here.)