【简答题】A—select phone line B—Adjust ring volume C—ring or vibrate D—phone lock E—adjust contrast F—require SIM CARD Pin G—show time and date H—language selection I—set time format J—entry method selection K—...
【多选题】To get 6V DC output, users can follow the instructions: turn the DC CURRENT ADJUST knob fully clockwise, then adjust the ( ) knob until the 6V indicated on the meter.