Zealot MT01M Retro Card Portable Wireless Bluetooth Speaker with Microphone 1. Cinema-level loud volume, no compromise on sound quality, suitable for a variety of scenarios 2. Built-in dynamic loudness helps to adjust the sound tone balance, full sense of space 3. Super long battery life, say goodbye to anxiety 4. Stronger signal penetration, lower power consumption, faster and more stable connection, and wide compatibility 5. Supports wireless connection of two speakers, independent output of left and right channels 6. Portable handheld design, easy to carry 7. Supports multiple playback modes, Bluetooth, TF card, AUX, U disk mode Product parameters Bluetooth version: 5.3 Transmission distance: about 10m Battery capacity: 24000mAh Working voltage: 7.4V Listening time: about 6-7 hours Charging time: about 3 hours Signal-to-noise ratio: greater than or equal to 90dB Distortion: less than 1% Speaker power: 60W Frequency response: 20Hz-20kHz Charging interface: Type-C