Product parameters:1. Model: A1072. Bluetooth: V4.23. Effective distance: 10m4. Output power: 3W5. Impedance: 2.6Ω6. Battery: 3.7V / 500mAh7.Size: 48mm * 54mmProduct selling points:1.Small size, high volume, good sound quality, sound effect is comparable to thousand yuan models;2. TWS 1 + 1 can be played in series to form a stereo surround sound effect to meet your higher quality requirements;3.Using Bluetooth V4.2 chip, the transmission and playback are stable and the compatibility is stronger;4. Support TF card insertion (large 64GB), can enjoy music without network.