CONFORMS TO EN352-1 H=33 M=30 L=24 SNR=32 Connect wirelessly, answer calls, and stream information from your mobile phone. E asy push-button connectivity to any Bluetooth® device. Robust boom microphone with windsock for voice clarity in high-noise enviroments. Lithium-ion battery featuring 16+ hours of battery life while streaming. Volume control buttons and flashing coloured lights visually indicate different settings. No battery replacement required; includes USB cable and wall charger