New for Vertex 820/920 radios, Klein Electronics has introduced the Sentry Professional 2-Wire Surveillance Earpiece. Specially designed and newly manufactured for the Vertex 820 and 920 Public Safety Series radios, this earpiece kit features a comfortable acoustic coil tube that comes in black or clear, an internal dual PTT button and microphone for extra street life, junction box with strain reliefs and premium grade thicker cabling, and swivel clothing clip. The Sentry is only available through Klein Electronics.