Long-lasting battery: Enjoy over 8 hours of continuous use with the built-in 1500mAH rechargeable battery. High signal-to-noise ratio: Experience high-quality audio with minimal distortion and noise, thanks to a THD+N of 0.0003%. Portable design: Compact and lightweight, making it easy to carry and enjoy music on the go. Wide compatibility: Works with various digital devices including MP3 players, mobile phones, and computers. Superior sound quality: Delivers accurate, delicate, and wide-ranging sound with reduced distortion for an immersive listening experience. Item Name: Headphone Amplifier Material: Aluminum Alloy Features: Versatile, Convenient, Durable Input And Output: 3.5mm AUX Signal-to-noise Ratio: > 100 DB Battery: 1500mAH Rechargeable Battery Continuous Working Time: More Than 8 Hours Size Details: L: 11.2cm/4.41", W: 6.2cm/2.44", H: 1.1cm/0.43" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Headphone Amplifier 1 x 3.5mm Audio Line 1 x USB Charging Cable