Item:Power: 5B BatteryOutput: RMS 3W * 2Frequency range: 50Hz-18KHzSNR: ��85dbSensitivity: 500mvImpedance: 4HM (��)Input: USB DC 5VSpeaker Unit: 3 4�� 3W * 2Battery playback duration moderate volume: 300minBluetooth Solutions / Version: 3.0 Jianrong /2.1 compatibleAppearance Material: ABS materialBattery capacity: 600mahWeight: 430.1gSpeaker size: 23 * 6.5 * 6.5cmOfficial standard: audio cable， USB charging cable