Product model number: BT-N9 Bluetooth speaker1.Music play for Bluetooth Function: Bluetooth 2.0 Stereo module, open spaces area validity distance 18-20M, support A2DP protocol music stereo play back (support A2DP Mobile phone or PC with music play back.)2.AUX function: Line in audio input, you can connected with MP3/MP4, VCD/DVD/EVD, PC device or PDA etc.SPECIFICATION:1. Power Supply: input AC 100-240V /50-60HZ output: DC 5V / 1A2. Batteries: with the 3.7V/1000mA lithium batteries inside 3. Impedance: 4 ohms X 24. Output power(RMS):2 X 2.5 W 5. Frequency Response: 100Hz --- 18KHz6. Signal-to-Noise Ratio:Bluetooth:60dB AUX Input:70dB7. Product size :( L) 230mm* (W) 70mm * (H) 40mm