4-008 + 44-M328plus : 2-Wire Comfort Earpiece w/Combined Microphone & PTT. 空氣導管耳機 防輻射 高清音質 耳機 透明管便於隱蔽，空氣導管傳輸信號可降低雜音 耳機線是空氣傳輸聲音的，就如圖片是管子狀的，耳機是像游泳耳塞差不多，所以絕對放心不會脫落且很軟、舒服。 帶PTT和MIC，可以夾在衣領上或衣袖上的，就像特工一樣的，不信你可以留心什麼國家大任務來訪邊上的保鏢就帶這個東西。 主要是輻射小，和佩帶舒服！ 包裝配有: 1 x  空氣導管耳機  　   　 Black Surveillance Kits w/Extended Wear Comfort Earpieces include a Low Noise enhancement already attached for extra comfort and convenience. 　 The two-wire earphone kit provides excellent durability, reliability and performance in low-profile environment. This is ideal for demanding covert security applications where sound clarity and durability are of paramount importance. Apart from surveillance purposes, it is also commonly used for security at airports, casinos, manufacturing plants, croed-control at conventions and concerts, and other working environment requiring discret communications. PACKAGE CONTAIN 1 x 2-Wire Earpiece w/Combined MIC & PTT 1 x Mini Din Plug