MA 29-LK microphone headset, Kenwood The MA 29 can be worn on either the right or left ear. It is made of durable material, which is ideal for long-term use. The built-in push-to-talk (PTT) button facilitates communication even when the radio is not immediately accessible. The high-sensitivity microphone with noise-cancelling filter and HD speaker ensure clear and strong communication even in noisy environments, while the braided fibre cable prevents tangling. The headset can be connected to radios with 2.5/3.5-mm Albrecht/Midland circuit thanks to the 90° angled plug.