Mistral 300 set with wireless doorbell button SE03 – pre-programmed and ready to use right out of the box. 500 meters range (open field): The interference-free wireless connection up to 500 meters ensures a reliable door chime. 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 distinction for multiple doors: With the call distinction feature, you can immediately tell whether someone is ringing 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, you can activate the bright LED flash as a visual signal. Low battery indication: The wireless chime provides a visual and audible alert when the batteries in the doorbell button and chime are nearly depleted. This way, you won't miss any visitors due to a surprise battery failure. Note: Walls, doors, metal parts, etc., can significantly reduce the range.