... 1.5m from ground,Press the key ,turn on power and turn on critical sound,then relax the key ,Let the plate near ground about ... up ,up the palte and press the key ,then turn knod left a little.test again. If the voice down ,turn right .until the voice have ... up ,up the palte and press the key ,then turn knod left a little.test again. If the voice down ,turn right .until the voice have ...