"Features: 1. Can be used with most car radio 2. Can also be used with external B interface module 3. Provide better sounds performance in noisy environments 4.3.5mm standard plug, plug and play 5.3m length cable long distance transmission 6.New revamped design gives you better quality sound during transmission 7.Microphone can be picked up from the clip for the best sound effect 8.Adopting electret condenser cartridge with high sensitivity , low impedance , anti-noise and ant jamming capability 9.Microphone can be glued with sticker to the wall, glass, car, door, etc 10.With fast and accurate data transmission, guarantee the voice clearly and stably under kinds driving occasions 11.Highly improved the speech quality of hand free car kit communication system