Plantronics Deep Sleep power-saving mode activates when your M90 is away from your phone for over 90 minutes. When it's back in range (10 meters or less), you can just tap the Call button to "wake" it up. Using the Deep Sleep mode can extend battery readiness up to six months. Reduces noise, wind, & echo from calls & delivers HD audio clarity when used with wideb&-enabled smartphones & mobile service. During set up, select English, German, or Russian for status alerts on remaining talk time, battery level, & more. The lightweight design & soft eartip let you put it on & forget you're wearing it. Control your music & streaming audio using headset buttons instead of your smartphone. With up to 11 hours of talk time & 16 days of standby time you can talk more, charge less. 2-in-1 charging cable included to charge headset & phone simultaneously.