1、The built-in rechargeable lithium battery has a battery life of up to 7 hours, so user can take it to the show. At the same time, it is equipped with a Type-C cable, which is convenient for charging. 2、Plug and play, the guitar is easy to use. With small size, light weight and equipped with storage bag, the guitar is easy to carry. 3、In a special condition, some channels work with multiple sets of different types of 5.8G products, and the channels are congested, so users can freely choose other channels, and the system starts with 1 frequency band by default. A total of 8 frequency bands can be selected for this product. 4、If the transmitter and receiver are both powered on, the 1D indicator of the receiver keeps flashing, and user need to re-pair at this time. 5、When the battery is low, the indicator light will flash until out of power. When it is plugged into the USB port for charging, CHARGE will light up, and it will go out when it is fully charged. If the ID indicator does not light up, there may be insufficient battery, you need to try to charge. ItemType: Wireless Guitar System Material: ABS Response Frequency Range: 20Hz--20KHz Power Supply Type: Lithium battery (shipped with built-in battery) Battery Capacity: 600mAh Life Time: 7hrs Use Channel: 5.8G Transmission Distance: Approx. > 40 meters / 131.2ft Sound Delay: <5ms Sampling: 32K 24bit 1 x Wireless Guitar System 1 x Guitar Wireless Receiver 1 x Type-C Charging Cable 1 x Adapter Cable 1 x Chinese and English User Manual 1 x Storage Box