Strong penetration, no need to worry about not receiving the signal LED blue light: Unique LED blue light design, flashes after the ringtone. Robust and durable, safe to use. Use Product features: Use solar spotlights to save energy; energy saving is sustainable Open space autonomy: maximum 300 m 4 adjustable volume levels, 38 different melody styles to choose from. One transmitter can be assigned to à multiple receivers. One receiver can also be assigned to the receiver. à Multiple transmitters. Operating voltage: 90-260 V Power consumption: 2 W Note: The data is all measured manually, please allow an error of 1 à 5cm, due to the difference in light and display, there will be a certain color difference, the actual received object shall prevail.