... support playback of file by timeWireless transmission (auxiliary machine)Built-in 3G wireless transmission module, WCDMA, CDMA2000, ... off-screen, automatic off- screenBattery capacityMain machine: 1500mAh, 3.7VAuxiliary machine: 2100mAh, 7.4VCharging period<3 hoursWorking periodIndependent ... .8(H) x32.4(D) mmWeightMain machine : net weight:280 g, gross weight: 307.5g Front Panel1. Power/charging ...