Feature: 1. Support plug‑in cards, wide compatibility, support multiple compatibility modes. 2. Retro speakers, excellent sound quality, bring excellent music experience. 3. Mini portable speaker, small and light, easy to carry when traveling. 4. Professional manufacturing, stable performance and high reliability. 5. 2 different colors for you to choose, meet your different needs. Specification: Condition: 100% brand new Item type: Speaker Material: plastic + metal Weight: Approx. 435g Output power: 5W Speaker size: 2in 45 magnet X 1 Frequency response: 45HZ-18KHZ Charging voltage: DC5V / 1000MA Battery voltage: 3.2-4.2V Signal to noise ratio: 65dB Distortion: ≤0.5% Model: FT-05U Built-in: lithium battery (3.7V 1200mAh) version: 4.2 Charging time: about 2-3 hours Package List: 1 x Speaker 1 x Connection line 1 x Instruction