The set has a solid construction and is used here in an apartment with three partitions. We had the transmitter and receiver already four floors inside the old building in use. For the transmitter, we use the appropriate power supply and the receiver is powered by batteries. Unfortunately, these must also be replaced every 2-3 days, the usage is usually 5 hours a day. AC adapter and appropriate battery should be compulsory! Here, the transmitter is also already "sending-in-noise" and not set to continuous operation.
