Takstar E180M Voice Amplifier 12W, Support USB disk and TF card, 20 hours of continuous white (BLACK) Digital circuitry technology, 12W output power  Music play function supports multimedia audio file play of USB flash disk and TF card LOW-THD AT Adaptive Technology features low distortion even at high output power  Built-in high capacity rechargeable lithium-ion battery Built-in MCU intelligent recharging management system for secure battery charging and discharging, fast charging time (4-6hrs) and long play time (more than 20hrs) With AUX audio signal input function, as a small speaker  Exquisite and durable design Choices of waist or shoulder hanging wear style for convenient use