The Sonim Rugged Remote Speaker Microphone (BTR-155) is a rugged Bluetooth® extension for professionals in extreme industries such as law enforcement, security, first response, construction, and logistics. The BTR-155 gives you the freedom to step out of your vehicle and roam (up to 10 meters) while staying connected. With Push-To-Talk, full duplex voice call support, extended talk tim and the ability to withstand water, dust, and falls, the Sonim BT RSM is perfect for professionals that demand reliable hands-free connectivity at all times, in any environment.