The Charge Monitor is a sensitive, weatherproof, vibration proof three LED ammeter that gives a clear indication of your bike’s alternator output with a quick glance. The Charge Monitor lets you know if your alternator is providing sufficient current. If it drops to the “low” LED, or flickers between the “normal” and “low” LED, it indicates that your bike’s the alternator is not making a steady supply of electricity. This is good immediate information to monitor, because warns you before the battery becomes discharged. (Most smaller machines have limited excess battery charging capacity...) The LEDs are housed in a small matchbook-sized, durable, easy-to-install case (included double stick adhesive) with epoxy incapsulated electronics. Even more information when installed combination with the #4950 three LED Voltmeter. 1.5"×1"×.375".