A fish detection accessory to be installed on the end of a fishing pole or which alternately can be incorporated into a fishing pole during manufacture of the pole. The unit employs a miniature dual axis accelerometer integrated circuit that can detect angular rotation of the unit relative to the earth's surface, allowing the unit to detect a fish bite based on vibration method, i.e. rotation of the pole per unit time, or on a rotation method, i.e. rotation of the pole independent of time. Bite detection sensitivity levels and alarm methods can be selected by the user using the power switch and two setting switches. The unit can also be used as a mini flashlight.