ZMR FPV Racing Outdoor Battery Charger to Mobile Phone / Drone 5.2V-26V 1.5A with Alarm XT60 Plug Specification: Brand name: ZMRItem name: Outdoor Battery Charger Working voltage: 5.2V-26 V Charging current: 1.5 A Automatically identify the number of battery cells. Set the alarm voltage: 3.4V 3.5V 3.6V 3.7V fourth gear Case meterial: 3D printed Set the model battery low voltage alarm method:- Long press the button for 3 seconds to enter the cutoff voltage setting. At this time, the LED will flash.- Short press the button to select the proper cutoff voltage within 3.4 to 3.7V (red LED indicates)- No keystrokes within 10 seconds, automatically save the current value & exit-If the total voltage is lower than the cutoff x number of units, an alarm will be triggered, the blue LED will flash, & the buzzer will continue Be.. Be.. Be.. Be....- If the total voltage rises above the cutoff x number of cells, the alarm is suspended. Package Included:1 x Charger