SOLAR POWERED: This lane alarm includes a solar-powered transmitter and receiver with a digital display. The transmitter is solar-powered to ensure continuous operation without the need for batteries or electrical outlets. The receiver features a digital display that makes it easy to check the alarm status. TRANSMISSION RANGE: The motion sensor alarm has a transmission range of 200-300 m, allowing you to monitor a wide range of activities. It has three detection sensitivity levels: low (5-8m), medium (8-12m), and high (13-16m) to meet your specific needs. 38 RINGTONES 4 VOLUME LEVELS: With 38 selectable melodies and 4 volume levels, including sound + indicator in sound mode and silent mode with indicator only, you can customize the Solar Driveway Alert to your liking. The variety of melodies and adjustable volume levels ensure that you won't miss any alerts. WIDE RANGE OF USE: The wireless driveway alarm uses FSK 433MHz wireless transmission technology to ensure stable and reliable