Power supply: Built-in lithium battery Frequency range: 90 HZ-20KHZ Format: MP3, WMA, WAV Number of speakers: 1 Soundbox adjustment mode: key Battery capacity: 1500 mHa Can LOGO: be printed Function: Plug card, waterproof, dustproof, voice prompt, Bluetooth, TWS、 wired connection, mobile power supply Power supply: USB Color: Chinese red, cool black, cherry blossom powder Bluetooth Protocol: 5.0 Output power: 5 W Connection mode: 3.5 MM Audio socket Bluetooth connection Appearance Size: 128*70 Channel: Mono Box Material: Metal Shell Material: Metal Silicone Mode of operation: key Playtime: 12 hours Effective distance: 10 m Format: TF card SNR: 95 DB Extended storage: 32 GB