Review on Mengshen Wireless Bicycle Alarm: Anti-Theft Burglar Security Alarm for Bike, Motorcycle, Car, Vehicles, Door, Window - 113db Super Loud & Waterproof (Includes Remote Control) by Vivian Eker

First, the instructions are translated from Chinese to English, so it's terrible. If you want to change the sensitivity level, press and hold the unlock button until the LED button turns off and on again. You will hear noises. Don't pay attention to them. When the light turns back on, use the lock button to adjust the sensitivity. The higher the tone, the lower the sensitivity. Pay attention to the STEP, not the sound. It took me a while to figure out the high to low setting. Not low to high. It seems pretty cheap and I have a feeling it's going to stop working here pretty quickly. Also, the screwdriver provided is useless to access the battery of the alarm itself. The screw is useless. Haha I'll return it when it's near death because I can't remove the back cover to save my life. I personally. I would have found something better. This is sufficient for a short-term solution until then. It reacts when I try to open my car door. It reacts to light hits on the lock core. It reacts when I open the car door. But it's not 10/10 every time. About 60% of the time he catches it.