... light Switch ON: mode of vibrationIndicatorsFlashing yellow LED low battery indicatorFlashing red LED Alarm Flashing green LED Power on ... (1g), 30mm SpecificationOperating frequency,20kHzWeight, 272g (including the battery)Size, 420mm(L)X138mm(W)X110mm(H)Handle measurement,30 ... , manual BatteryAlkaline cell (7V - 9V) can work over 40 hours and distance does not changeBattery: 9V battery (suitable for ...