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The TRUEBLUE™ TB-31 is a lightweight yet feature rich powerful headset. The TB-31ML has a talk time of up to 10 hours and a standby time of up to 6 days. The TB-31ML is rich in features such as last Number redialing, Call-waiting, Voice activated dialing and Mute. *Features may vary with phone type. All this in a headset that weighs just over a quarter of an ounce.