Mini bluetooth speaker. The speakers are specifically customized to fit in a small form-factor, yet offering balanced sound with rich tones. The smooth metal housing has gone through metal stamping, polishing, sandblasting, anodized oxide coloring, and CNC diamond cutting to achieve its gorgeous exterior. This careful step-by-step process creates a structure robust enough to withstand various environments, while bringing you melodious notes at the same time. Mi Bluetooth Speaker Mini is seamlessly and elegantly designed with both the power button and the micro USB charging port neatly tucked at the bottom. The new CSR Bluetooth 4.0 chipset ensures an energy-efficient, long lasting, stable listening experience. Enjoy high-quality calling experience whether you are at home, in the office, or outdoors with the CVC 6.0 noise reduction technology. Specifications: Bluetooth version: 4.0; Effective range: 5m; Power rating: 2 W; Noise ratio: 53 dB; Rated impedance: 4Ω; Distortion: THD < 5%; Battery type: Non-removable rechargeable lithium-ion battery; Battery life: 4 hours (60dBA / 1m pink noise); Handsfree support: Yes; Weight: 58g, Dimensions: 52 x 52 x 25 mm, Color: Grey