What's in the box:

B9 Wireless Guitar System Rechargeable 4 Channels Guitar Transmitter Receiver Set Electric Guitar Bass Pick Up (Standard)

Wireless transmitter and receiver can be used for electroacoustic instruments such as guitar, bass and so on.

Features:
UHF 730MHz sound transmission, anti-interface and ultra-short delay, giving you nice music sound.
Supports 4 sets of devices working at same time, one-to-one, and max. transmission range is up to 50 meters.
Wireless transmitter and receiver set for electroacoustic musical instruments like guitar, bass, etc.
Built-in rechargeable lithium battery, long working hours, and comes with USB cable for convenient charge.
Plug and play, simple to use, compact size and lightweight, easy to carry.

Specifications:
Color: black
Material: plastics
Frequency: 20Hz-20KHz
Transmission delay: <4ms> Transmitter/receiver size: 103 * 42 * 17mm
Transmitter battery: 3.7V, 600mAh
Receiver battery: 3.7V, 600mAh
Package size: 120 * 85 * 40mm / 4.7 * 3.3 * 1.6in
Package weight: 125g / 4.4ounce

Packing List:
1 * Transmitter
1 * Receiver
1 * USB Cable