Mistral 300 set with wireless doorbell button SE03 – pre-programmed at the factory and ready for immediate use. 500 meters range (open field): The interference-free wireless connection up to 500 meters ensures a reliable doorbell. This range can be extended with the use of our repeater. 16 polyphonic melodies: With a wide selection of appealing ringtones, you can customize your Mistral 300 flexibly. Multiple call differentiation for several doors: With the call differentiation feature, you can instantly tell whether the doorbell rang at the front door or the garden gate. Up to 20 wireless doorbell buttons can be programmed, and 17 can be assigned a unique ringtone. Visual LED signal: In addition to the ringtone, activate the bright LED flash as a visual signal. Low battery indicator: The wireless doorbell provides a visual and acoustic signal when the batteries in the doorbell button and the chime are nearly depleted. This way, you won't miss any visitors due to a suddenly empty battery. Note: Walls, doors, metal parts, etc. can significantly reduce the range!.