Please note, this item ships from an international seller. Expected delivery is 10-15 days. Product Features: Wireless transmitters and receivers can be used for electroacoustic instruments such as guitars, bass, violins, and the like. Ultra-high frequency 730mhz acoustic transmission, anti-interference, ultra-short delay. Supports 4 groups of devices to use at the same time, the maximum transmission range is up to 50 meters. Built-in rechargeable lithium battery, long working hours, with USB cable, easy to charge. Plug and play, easy to use, small size, light weight, easy to carry. Specification: Audio response range: 20Hz-20kHz Frequency: high frequency 730mhz Transmission range: max.50m (accessible); 30m (through wall) Transmission delay: less than 4ms Power: Built-in 3.7V 600mah rechargeable lithium battery Charging time: 2 hours Continuous use time: 6 hours Charging port: micro USB Product size: 11 ? 4.5 ? 1.5 cm / 4.3 ? 1.8 ? 0.6in Packing size: 17.5 ? 10.5 ? 5cm / 6.9 ? 4.1 ? 2in Shipping includes: 1PC transmitter 1pc receiver 1pc data line 1pc Chinese and English manual wirelesstransmitterreceiverset