Features:Ideal for DJI Phantom/Phantom 2.Clever design with loud alarm "beep" sound lasting for about 30 seconds when timing out.With an easy-to-read LCD.3 buttons on the timer for your convenient operation.M button: sets desired minutes，S button: sets desired seconds，Start/ stop button: start/ stop timer.When the second is Zero， alarm is activated， press any button for stopping alarm.Press M + S button: returns to zero.You can take it anywhere for emergency use.Compact， lightweight & easy to carry.Powered by 1 x 1.5V LR1154H/AG13/LR44 cell button battery (included)Specifications:Compatible with: DJI Phantom/Phantom 2Colour: WhiteMaximum countdown capacity: 99 minute 59 secondsDiameter: Approx.2.48inch/6.3cm1x Countdown Timer Alarm For Dji Phantom