Main Features:- With Bluetooth 3.0 wireless technology, high-speed data transmission, strong anti-interference, it can be used indoor or outdo- Built-in 400mAh capacity lithium-ion battery, standby time up to 10hrs- Support TF card, capacity up to 64G ( card not included )- Fashionable and graceful appearance make it become an ornament of your desk- Accord with acoustic and aesthetics design principle- Support volume control function, convenient to operate- Built-in microphone for hands-free call, to keep your safety in drivingHow to use TF/ micro SD card:Before you use the TF/ micro SD card, you need to format the memory card into FTA32 format, only support to put MP3 format songs?Model: A9?Design: Cool,Fun,Mini,Multifunctional,Portable,Stylish?Compatible with: MP3,TF/Micro SD Card?Supports: Bluetooth,Hands-free Calls,Loudspeaker,Microphone,TF Card Music Playing?Functions: AUX Function,Songs Track?Connection: Wireless?Interface: 3.5mm Audio,Microphone,Mini USB,TF Card Slot,USB2.0?Audio Source: Bluetooth Enabled Devices,Electronic Products with 3.5mm Plug,TF/Micro SD Card?Speaker Impedance: 4 oh*mBluetooth Version: V3.0?TF Card Extension: 64G to the Max.(Not Included)?Transmission Distance: W/O obstacles 10m?Power Output: 3W?Freq: 20Hz-20KHz?S/N: 95dB?FM Radio Frequency: 87.5-108MHzPower Source: USB?Charging Voltage: 5V?Battery Capacity: 400mAh?Charging Time: 2.5 hours?Working Time: 2 hoursBattery Type: Lithium-ion battery?Battery Voltage: 3.7VPackage weight: 0.186 kg?Product size (L x W x H): 6.00 x 6.00 x 5.80 cm / 2.36 x 2.36 x 2.28 inches?Package size (L x W x H): 6.50 x 6.50 x 7.50 cm / 2.56 x 2.56 x 2.95 inchesPackage Contents: 1 x A9 Mini Wireless Bluetooth Speaker, 1 x USB Cable