Built in Bluetooth > Brilliant Clarity > Micro SD Card Reader Plug & Play > AUX input > FM radio > Answer phone calls and talk via Bluetooth Speaker > Built in rechargeable Lithium Ion Battery (2h-3h playtime) > Speaker 45mm 4Ω3W > Frequency response: 150-3000Hz > Battery Capacity: 400mAh > Weight: 178g > Dimension: 6cm x 6cm x 5.2cm