beep

nextbeep = CurTime()

function SWEP:Think()
    for _, veh in pairs(ents.FindByClass("prop_vehicle_jeep")) do
        local dist = self.Owner:GetPos():Distance(veh:GetPos())

        if CurTime() > nextbeep then

            local nextTime = 0.0001*dist+0.2388
            local nextVolu = -0.0015*dist+82.2388

            if nextTime < 0.2 then
                nextTime = 0.2
            end

            self:EmitSound("weapons/stunstick/stunstick_swing1.wav", nextVolu)
            nextbeep = CurTime()+nextTime

        end
    end
end