Applicable: Add peripherals to your fire TV stick 4K or host device. Connects USB keyboard to Fire TV Stick or Amazon Fire TV device, compatible with the most popular streaming and media devices.( NOT 1ST GEN sticks ). Supports mobile phones or devices with OTG function. NOTE: Will not charge phones or tablets but can power on streaming sticks. If used on a mobile phone, it only supports the OTG function. Advantage: Micro female port provide power for USB peripherals. Make sure your device's battery will not run out as quickly as other ordinary OTG cables. Expansion: Add any USB peripheral such as USB flash drives (Format must be FAT32), USB card readers, keyboards, mouse, external hard drives, USB ethernet adapters, game controllers, etc. to the host device. Package: 2 Pack fire stick usb adapter. Please confirm your device supports OTG function before bidding.