The Midland BTX 2 & 1 Pro S Twin Intercom Headset is a set which includes both the BTX1 PRO S and the BTX2 Pro S systems.BTX1 PRO S and the BTX2 Pro S setDNK Function (Digital Noise Killer)Hi-fi speakerCompatibility with TFTCompatible with high definition sound by RCF (optional)The Midland BTX 2 & 1 Pro S Twin Intercom Headset is a set which includes both the BTX1 PRO S and the BTX2 Pro S systems.BTX2 Pro S - The Midland BTX2 Pro S LR Twin Intercom Headset is a long distance intercom which allows for great communication up to 1600m. With a usage time of 23 hours you are sure to be in contact with your party for the entirety of your ride. This intercom is the only one in its category to have 2 Bluetooth chipset, this means that the chips manage the communication, dividing them between the two chips which means you can listen to music in the background but also continue to talk to the rest of your riding party without any problems. The added DNK Function (digital noise killer) helps redu