Rolton K700 Bluetooth Dual-speaker Audio Speaker Megaphone Voice Amplifier 1. Double speaker design, louder, more mellow tone 2. Bluetooth wireless transmission, wireless distance stable 15 meters 3. Support FM radio, TF card playback 4. Insert the memory card can be recorded, automatically saved, can be designated to play in a loop, very suitable for the use of sales promotion 5. Built-in 2000 mA lithium battery, standby time 80 hours, can be used while charging 6. Note: the need to achieve wireless functions to be equipped with a separate transmitter or wireless microphone. Parameters: 1. Material process: UV process + ABS plastic 2. Power: 5W 3. Charging voltage: DC5V 4. Function: amplification recording playback radio 5. Signal to noise ratio: 83dB 6. Distortion: 1% (3.7V, 1KHz, 1W) 7. Charging time: about 3.5 hours 8. Size: 11 x 7.8 x 3.3cm 9. Weight: 147g Packing list: Audio speaker x 1 Wired headset microphone x 1 USB data cable line x 1 Belt x 1 Instruction manual x 1