Rolton T1 Portable Radio Receiver Old People Singing Opera Player Mini Stereo Walkman 1. Bluetooth protocol: 5.0 2. Playback function: MP3 3. Input voltage: DC5V 4. Playback time: 8 hours 5. Chip model: QN8035 6. Battery capacity: 550mAh 7. Support format: TF card (not included) 8. Playback format: MP3, WMA, WAV 9. Radio frequency: FM 76-108MHZ 10. Weight: about 81 g 11. Size: about 9.1 x 4.8 x 2.1 cm 12. Packing list: speaker x1, data cable x1, lanyard x1, manual x1 Features: 1. HIFI sound quality, shocking volume, TF plug-in headphone playback 2. Soft sound quality, take care of your hearing, 36 caliber speakers, low-frequency dive, and flexible 3. Powerful radio, using QN8035 professional-grade radio chip, plus a rod antenna, double the signal 4. 2-inch LED liquid crystal display, clear display of power, can receive campus radio, more convenient to use 5. With flashlight function, thoughtful design for the elderly, walking night lighting, emergency backup 6. 2 hours of charging, use all day, built-in high-capacity batteries, long-lasting life, so that you continue to be wonderful 7. Power failure memory, save heart and quick, audio power failure when the operating state memory lock, can record the song playback 8. Digital song request, directly enter the frequency band or number to search and listen to the radio station and built-in songs, simple operation 9. Upgraded bluetooth 5.0, the connection is more stable, the distance is farther, compatible with most of the cell phones, tablets, computers and other smart devices