Advanced Headset G Shape Police Earpiece for Hytera Radio C1688 TC310 TC320 Advanced G Shape Earpiece Earphone Headset PTT(Push To Talk) with built-in line mic microphone for Hytera TC1688 TC310 TC320 Radio Security Door Supervisor. The earpiece and PTT using better materials and components, allows longer time use. Provides excellent durability, reliability and performance in low-profile environment. Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments. Compatible with Hytera Radio: TC1688/TC-1688, TC310/TC-310, TC320/TC-320.