Function: plug in card certificate type: RoHS type: Portable Speaker launch time: 2018 connection method: Bluetooth connection interface type: USB frequency response range: 40Hz-20KHz output power: 5W signal-to-noise ratio: 75db power supply method: built-in lithium battery sound channel: 2.1 playback time: 3 hours extended storage: 32GB Bluetooth protocol: 4.1 number of speakers: 2 effective distance: 15m operation method: keys applicable crowd: General display Screen: none shell material: Plastic support format: TF Card speaker adjustment method: key box material: ABS appearance size: 41.7 * 37 * 27cm product weight: 0.35 printed logo: OK processing method: OEM processing fastest shipping time: 1-3 days item No.: M268 power supply method: USB battery capacity: 1200 Ma