Hidden PTT mic transmits the sound effectively and clearly and easily clip to anywhere. Soft rubber G shape ear hook is comfortable to wear for a long time. Compatible with Sepura STP8000, STP8030, STP8035, STP8038, STP9000. Attention: Does not fit the Sepura SRP2000, SRP3000, SRH 3500, SRH3800 range. Sepura STP8000 earpiece is perfect for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments.