Features: F21 Bluetooth-compatible card-insert radio, USB radio, portable music player with retractable-antenna for receiving FM signals. Upgraded bluetooth-compatible5.0 version has quick transmission, stable signal, low power consumption, and no distortion, supports FLAC and APE music lossless-decoding. Supports TF-card playback, U-disk playback, earphone playback, suitable for use in different scenarios, and enjoy HiFi-music. Small and lightweight, convenient to carry with equipped with hand strap, great for elder, listen to music and radio in their spare-time, bringing joy to the boring life. USB quick charging, more convenient to use. Specifications: Material: ABS Color: Black, Red, Green, Orange(optional) Size: Approx. 104x26x61mm/4.09x1.02x2.40inch Model: F21 Speaker: 1.5-inch double magnetic speaker Rated-power: 3Watt Frequency Response: 100Hz-18KHz Bluetooth-compatible Version: BLE5.0 Battery: 750mAh polymer lithium-battery Input: DC5V1A Basic Functions: BT5.0/TF-card/USB/FM/Digital VOD/Lossless- music play/full-mode recording/one-key delete function FM radio supports campus broadcasting, with a frequency ranges of 70-108MHz Package Includes: 1x Portable FM Radio note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.