A. [Compatibility] This radio earpiece compatible with Motorola XPR 6100/6350/6380/6550/6580/6500/6300/7550/7580/7350/7000e/7550e/7580e/7350e//7380e, APX 1000/2000/3000/4000/6000/6000XE/7000/7000XE/8000/8000XE, etc. B. [Clear Acoustic Coil Tube] This comfortable surveillance earpiece with transparent coiled cord and rubber earbud greater comfort for extended use. The in-ear design allows the radio's sound to be transmitted clearly into the ear without interference from the surrounding environment. The package also includes a replacement earbud. C. [ Large PTT] Dual-line large PTT button for easy pressing. High sensitivity microphone makes it easy to be heard clearly even in loud environments. D. [Durability] The earpiece cable is made of environmentally friendly PU cable which compliance with ROHS, contains high intensity Kelver, and has been tested for temperature and tensile resistance to provide longer life.