Decreasing speed when unequipping a tool doesn't work?

Ok so this tool functions like a speed coil (kinda) and I need the speed to be back to normal when the player unequips it but it's not working for some reason? Giving me an error which says:

"UnEquipped is not a valid member of Tool"

local tool = script.Parent.Parent

tool.Equipped:Connect(function() --Will listen for when the player equips the tool then connects to the enclosed function
    local char = tool.Parent --When a tool is equipped it moves from the backpack to the character model
    char.Humanoid.WalkSpeed = 14 --Sets the walkspeed by finding the humanoid that's under the character
end)

tool.UnEquipped:Connect(function() --Will listen for when the player equips the tool then connects to the enclosed function
    local char = tool.Parent --When a tool is equipped it moves from the backpack to the character model
    char.Humanoid.WalkSpeed = 12 --Sets the walkspeed by finding the humanoid that's under the character
end)