1. Choice of 38 pre-set polyphonic melodies 2. Wireless transmission; easy installation and battery replacement 4. Transmitter powered by a CR2032 button cell battery(lasts over 12 months) 5. Adjustable volume (4 levels) 6. Digital pairing prevents signal interference with neighbors 7. Volume: 85 dB (measured at 0.5 meters) 8. Suitable for shops, malls, supermarkets, convenience stores, specialty stores, etc. 9. Operating range: approximately 150 meters (unobstructed) 10. Receiver features flashing light and vibration functions 11. Power voltage: 110Vā260V
