A9 Wireless Guitar System 2.4Ghz Built-In Rechargeable Lithium Battery, Blue ? Uncompressed Wireless Signal Transmission??2.4GHz band is optimal for wireless guitar transmitter receiver system, low noise, low latency ( 15ms), supporting 3 sets of devices working at the same time (1 to 1) no interference, about 100 feet effective transmission range. High quality restore the original instrument sound. ? High Compatibility??The plugs can be rotated for 270 degrees, compatible for most electric guitar, bass, acoustic guitar and other digital music instruments with 1/4" jack. The device are approved for worldwide use. ? Long Battery Life??Built-in durable rechargeable li-battery with over 5 hrs battery life once 1.5 hrs charged simultaneously by a dual-ended Micro USB cable (included), enough to enjoy the wireless world freely in your gig, fast and convenient! ? Plug and Play??Pull up to turn on the power and paired automatically. Press and hold the transmitter for 3 seconds to switch 2 modes. Green light showing on the receiver works in acoustic guitar mode, and blue light works in electric guitar mode. That's how simple it is. No wires, more freedom. ? Legible and Easy to Use??One unit is labeled for the guitar (transmitter), and one for the amp (receiver). Literally just plug and go. Unique design is easy to recognize and play. It is the best choice for beginner guitar, professional guitarist, bass player.