Savox K551071 Promate BTR-155 Bluetooth Remote Speaker Microphone. The Savox BTR-155 is the perfect accessory for your professional LTE, PoC, Smartphone or Tablet unit for wireless operation. The extremely rugged design of the SAVOX Promate BTR-155 remote speaker microphone provides the ultimate platform for all end-users. It is light, robust (to IP55), and the function buttons have been designed so it can be operated with protective gloves. Superior audio clarity and volume output. Push-to-talk over wireless network. Dust & water resistant (IP55). Full duplex call functionality, Volume control, Ergonomic & ruggedized, Large buttons for use with gloves, Rotating belt clip. Compatible with all leading PTT applications. Additional earphones and car mounting clip available separately. Up to 30 hours talk time. Operational Temperature - Min: -20°C (-4°F), Max: 60°C (140°F). Storage Temperature - Min: -20°C (-4°F), Max - 60°C (140°F). Battery Life Time: 30 h/240 h, Battery Capacity: 1.05 Ah, Battery Charging Time: 7200 s, Connectivity: Wireless.