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Safety Technology International, Inc. -STI-V34100 Wireless Solar Powered Driveway Monitor with Voice Receiver â You can always be assured that the improved solar powered Wireless Driveway Monitor notify you when a vehicle enters or exits your driveway. This small rugged waterproof sensor is easy to install. When sensor detects a vehicle, it signals the 4-Channel Voice Receiver (included), causing the receiver to sound a programmable voice message. The receiver offers ten tones/tunes and 53 selectable words (available in English or Spanish). Effective range of up to 1,000 feet (line of sight) away from the sensor. The driveway sensor uses a solar powered patented magnetometer sensor system. Movement of any large metallic (iron or steel) object with a magnetic field causes the sensor to transmit to the receiver. Sensor is sensor is solar powered (includes 2 AA NiMH rechargeable batteries).NOTE: Maximum optimal range for vehicle detection is 12 feet; multiple sensors (purchase the STI model 34101 separately to increase range) may be required for driveways exceeding this width / range. Has a 1 year warranty from the date of original purchase. Safety Technology International, Inc. ‘We protect the things that protect you.â