Vibration Activated LCD Tach/hour Meter For 2 4 Stroke Gas Engine Motorbike High waterproof standard, you can put it underwater and still work Build in battery, battery life is as long as five years. Has the same features as hour meter plus tachometer feature. Package includes: 1x Vibration Activated TACH/HOUR Meter For 2 4 Stroke Gas Engine Motorbike