VT VT9400 DECT - Headset Battery

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While docked in the VT 9400 DECT Headset.
Wireless standard:
(CAT - IQ) European DECT and U.S. DECT.
DECT range:
For European DECT, up to 120 meters from VT 9400 DECT Headset base to headset.
For U.S. DECT, up to 350 feet from VT 9400 DECT Headset base to headset.
DECT frequencies:
US DECT: 1.92 - 1.93 GHz.
EU DECT: 1.88 - 1.90 GHz.
Wearing-styles:
Headband and ear hook
Microphone boom arm style:
Long boom arm。
Speaker(s):
Wideband speaker.
Microphone:
noise-cancelling microphone.
7.2 Headset Battery
Battery type:
Lithium Ion-polymer.
Battery capacity:
300 ma/h, typical.
Battery talk time:
Up to 8 hours.
Battery lifetime:
Minimum 1000 charge cycles.
Battery standby time:
At least 36 hours.