Bluetooth 5.1: Built-in V5.1 core chip, stable transmission, longer connection distance, wired constraints, enjoy wireless music. Colorful atmosphere lighting: Light button switch, full of atmosphere, double visual and auditory enjoyment. Fully enclosed transparent speaker: Adopting a fully enclosed transparent sound cavity design, while ensuring the light effect of the speaker, it also greatly improves the bass effect of the speaker. HD speaker unit: built-in full-range internal magnetic speaker, HIFI shocking sound effect. Large capacity endurance: 800mAh large capacity battery, charging time is about 4 hours<br><br>Multi-mode use:Support Bluetooth/TF card, enjoy music anytime, anywhere. Free your hands:Answer mobile phone calls with one click, easy hands-free calls, crisp and clear sound. Rated voltage: DC 5V+0.5/2A Power mode: USB--C Nominal power: 2x3W Built-in battery: 3.7V/800mAh Battery capacity: 800mAh Frequency response range: 120HZ-18KHZ Speaker: 4 ohm 5W Signal-to-noise ratio: 85dB Battery life: 3 hours of charging, about 3-4H of playback at 100% volume Bluetooth version: Jelly 5.1 + Specification:F:Knob Colour:B:Black Material:plastic<br><br>Package Contents: 1 x Retro Bluetooth Speaker 1 x USB Cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.