A precise, continuous way to monitor your bike’s alternator output and battery condition. An essential instrument if your bike has bigger or extra lights, or other powered accessories. Its solid state, waterproof, ultra compact design is extremely durable. Small so it fits anywhere. Indicates from 9V to 16V using eight colored LED’s. A sensor auto-dims the LED’s at night. If the voltage readout goes below 10V, a red LED alert flashes. Small electrical system changes are noticeable at a glance. Two–wire installation. 2"×.75"×.2"