Feature    --Lightweight and compact, perfect accessories for your guitar. ARU-02 wireless audio transmission completed with ARU-02 Transmitter and ARU-02 Receiver, adopts for UHF frequency and FM high fidelity coding technology. High quality signal is transmitted without compression or distortion, fully restore the really nice tone.--Delay time within 5mS gives you wonderful music experience.--With indicator for connecting, recharging and low power alarm.--Comes with a USB cable and antenna.--For all types of guitars and basses.      Specification    Brand: AromaModel: ARU-02Audio interface: 6.35mm mono audio plugChannel: 2 UHF Channels(A/B)Frequency: 731.7MHz / 717.3 MHzSystem Frequency Response: 40Hz~18KHz+-3dBSignal Noise Ratio: 20m(no obstacle)      ARU-02 Transmitter:    Power: rechargeable 3.7V/1000mAH Li-batteryPower: >10dBmMax. input signal amplitude: 500mVWork Hour: 8 Hours(full recharged)Charging Time:<3 hours        Transmitter Size: 135*91*32mm          ARU-02 Receiver:     Power Supply: 4 * AA Batteries(not included) or 5V USB CableSensitivity: <-110dBmSignal Noise Ratio: <-85dBAudio Cable Length: 90cmReceiver Size: 87*26*24mm            Package included:     1 x Transmitter1 x Receiver