Build to survive, JCK H-300 RSM is made to last, the rubber sealed housing makes H-300 RSM an easy choice in challenging & very wet working environments. Equipped with RJ45 socket makes it easy & smooth to change connector cable for users needs. A 3.5mm earpiece jack provides you the flexibility to receive audio communications more effectively. High performance microphone & speaker makes the H-300 RSM a smooth less experience for public safety, medical teams, fire fighters & many other applications. Build to last!