P20/P21 INVISIBLE TALK HEADSETP21 is a communication earpiece specifically designed for high intensity task scenarios such as riot control, security protection, and emergency communication in firefighting environments. It is compatible with most walkie talkie models on the market. With single or dual earpiece configurations and a quick release handheld ring PTT button design, it meets user needs in various practical application scenarios. Uses a 3. 5mm 3pin connection design