Zealot Portable Bluetooth Speaker S28(B) Features: - Supports TF card - supports bluetooth transmission - Supports USB Specifications: Input Voltage: DC5V Transmission Range: 10m SNR: >85dB Working Voltage: 3.7V Driver: 4ohms Frequency Range: 80Hz 20KHz Distortion: < 1% What's in the box 1 x wireless speaker 1 x USB cable 1 x user manual