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Works to 100,000 feet MSL, audibly reports peak altitude and maximum velocity after flight.

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No mach delay necessary for mach+ flights:  Automatic MachLock assures proper operation with any flight.

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Uses common type A23 12 volt battery (included).

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Precision sensor & 24 bit ADC yield superb 0.1% accuracy.

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Built-in voltmeter reports battery voltage on powerup – no more guessing about battery condition.

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Post flight locator siren aids in locating your rocket.

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Pressure sensor is immune to false triggering from exposure to sunlight.

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Highly resistant to false trigger from wind gusts; tested in 100+ MPH winds!

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Low power design – battery lasts for over 30 hours.  Post-flight locator siren will run for several days, giving you multiple “second chances” to find a lost rocket.

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Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure uncompromising reliability.

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Wide operating temperature range of -40F to +185F.

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Measures just 2.75"L x 0.55"W x 0.62"H, fits 18mm tube, weighs just 0.56 oz. including battery.

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Backed by full three year warranty.