i want a alarm for my bike to help stop ppl from stealing my bike but mostly to stop ppl from sitting on it or touching it when i am in class or chillin some where for a bit, i have come out of class and seen ppl sitting on my bike playing with it and it almost fell because i had the steering locked to the left and they where trying to turn it. so what alarm not too expense can i get to keep ppl from getting on my bike?