Feature: 1. Long-lasting Battery Life: With a built-in 3.7V 600mah rechargeable lithium battery， this device can run for up to 4 hours on a single charge. The red light stays lit while charging， ensuring you always know when it's ready to go. 2. Convenient USB Charging: This device comes with a USB data line that makes it easy to recharge whenever and wherever you need to. Whether you're at home or on the go， you can keep your music going without worrying about running out of power. 3. High-Frequency Sound Transmission: With a super high frequency of 730mhz， this device produces crystal-clear sound that can be transmitted up to 30 meters away. Plus， with a transmission delay of less than 4 seconds， you'll never miss a beat. 4. Flexible Adjustment: This device is designed to be adjusted to fit your needs perfectly. With a flexible range of 280°， you can adjust the angle to suit your playing style without affecting your rhythm or performance. 5. Versatile Compatibility: This device is suitable for use with a wide range of electric musical instruments， including electric guitars， basses， drums， and violins. No matter what type of instrument you play， this device can help you connect with your audience and take your music to the next level. Main material: ABS Product color: Black Frequency range: UHF Frequency broadband: 20Hz-20kHz Transmission delay: Less than 4ms Battery type: Rechargeable lithium battery 3.7V 600mah Charging interface: Micro USB Charging time: 2 hours Usage time: 4 hours Product size: About 110x43x17mm/4.33x1.69x0.66inch Net weight of product: About 78g Explanation: