Portable Speaker Noise Reduction BT Wireless Speaker Waterproof TWS Pairing Stereo Bassboom Technology Hands-free Calling for Home Outdoor Party Beach Supports TF Card/AUX/USB/FM Radio Mode Input Voltage: 5V Speaker: 4 Ω BT Solution: BT 5.0 Transmission Distance: 100 feet Frequency Response: 20Hz-20KHz Signal to Noise Ratio: ≥ 85dB Distortion: <1% TWS: Supports 2 speakers in series with TWS Working Voltage: 3.7V Battery Capacity: Built in 1800mAh battery Power: 5W, stereo sound Working Hours: 5-6 hours Charging Time: Approximately 1.5 hours Communication Distance: Barrier free 15 meters Product Material: ABS silicone+waterproof cloth mesh Product Color: Black, Blue, Green Camouflage (optional) Product Size: 74 * 74 * 123mm/2.9 * 2.9 * 4.8inch