Specifications: Item Name: Bluetooth Speaker Bluetooth Version: 3.0 Output Power: 4Ω, 5W Signal Noise Ratio: ≥85dB Max Sound Volume: 100dB Transmission Distance: ≤10m Rated Voltage: DC 5V Frequency Response: 120Hz - 18KHz Charging Time: 2Hours Playing Time: 3 - 4Hours Interface: USB, SD Card, AUX Interface Type: 3.5mm Size: 40 x 50mm x 110mm/1.57" x 1.97" x 4.33" (Approx.)