With Built-in Voltage booster module Working voltage: 3v-4.35v SD Card support max to 32GB SD Card need to use FAT32 Format Notes: Need to careful to insert the TF SD Card , and don't pull it out while install the battery. Wheelbase : Upper Shell Technical parameters : KV1100 Model Number : Openlager For Vehicle Type : Helicopters Tool Supplies : sticker Four-wheel Drive : Battery Remote Control Peripherals/Devices : Upgrade Parts/Accessories : Adapter RC Parts & Accs : AXLE is a very useful tools to the FpV pilots, They are used to using black box data analysis software to tune PlD and filter parameters. Due to the limited size of many flight controllers, especially flight controllers, although they have onboard black box functions, their storage capacity is very limited. Our is based on the latest Openlager hardware, uses a separate STM32F411 as the processor, has an TF card slot, and supports up to 32GB memory TF card. LED Indicator meaning: Red light off: SD card detected, ready to work Red light flashes slowly: no SD cardRed light flashes quickly: it will only appear after the drone was , and the black box normally writes t he data returned by the flight controller Colour:Black Material:PC Package Contents: 1 x Module(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.