frequency response:90-15KHz Signal to noise ratio:-68DB Distortion:<2% Speaker specification:4Ω3W Input voltage:DC5V-1A Battery capacity:400mAh Play time:4h around Charging time:1h around Product weight:70g Bluetooth transmission distance:≤10M Working temperature:-20℃-60℃ TWS function： Turn on 2 speakers simultaneously and make sure non-connect to any other device,amd when the 2 speakers paring successfully,the white light on.Then use your mobile phone connect to speaker named PD-S400