Engineered and molded for a controlled and consistent arrow release to ensure accuracy easy on/off activation. No magnets, pullout switches or knife points required. The Breadcrumb Bluetooth Trackable Nock is armed and ready with a simple touch of its water-resistant activation button. The ultra-bright LED is activated upon firing, Breadcrumb’s LED light acts as an illuminated tracer in flight, and becomes a pulsating beacon to aid in retrieval. The PCB processor, the brains behind it all, this tiny microprocessor controls the light, sound and Bluetooth tracking functions. Accelerometer this powerful piece of hardware uses a motion sensor to activate when fired and not while in your quiver. Sound chip and speaker, when an arrow is covered by earth and brush, this unique nock feature calls out to provide you its hidden location. Bluetooth transmitter, with a range up to 100 yards, this tech component reaches out to communicate directly with your smart phone. Replaceable battery providing more than 35 hours of continuous tracking power, the replaceable battery is controlled by the PCB to monitor battery life and conserve energy when needed.