Main Features:- Wireless microphone brings you unconstrained happiness- Using 170 - 790 MHz frequency to avoid the interference- Using multilevel high frequency narrow band filter, so as to dispel any possible interference signals- Using special ALC circuit to avoid losing your own sound due to big volume- With the low consumption components, the life of the battery will be much longer- With the power indicator circuit in the hand-held microphone, so you will know when to replace the battery- With the decreasing back-put whistle function, it can decrease the whistle efficiently- Power supply: One microphone is powered by 1 x 9V battery ( not included）Specification:- RF Carrier Frequency Range: 169.445 - 221.350MHz- Working Range: 100m ( approximately 300ft ) under typical conditions- Audio Frequency Response: 50 - 15KHz - Gain Adjustment Range: H: 40dBB: 25dB- Impedance: R ( output ) : 600 ohms ( XLR ); 5K ohms ( one forth inch phone jack )- RF Power Output:H, B: 50MW MAX.RF Sensitivity: -101 dBm, typical- Audio Polarity: Positive pressure on microphone diaphragm produces positive voltage on pin 2 with respect to pin 3 of low impedance output and tip of high impedance one forth inch output- System Distortion ( ref. ) : 0.7pct- Power Requirements: H, B: 9V alkaline battery, 8.4V Nicad rechargeable are optional but not recommendedR: 12V DC ( PS20, 120V AC; PS20E, 230V AC power supply )- Current Drain: H: 31mA average ( 40mA MAX. ), SM2: 30mA average ( 35mA MAX. )R: 160mA average ( 195mA MAX. )- Operation Temperature Range: -20 - 50 Deg.C ( -4 - 122 Deg.F ); Note: Battery characteristics may limit this range 1.360 Package weight: 1.412 kg Package Size(L x W x H): 35.00 x 5.50 x 28.00 cm / 13.78 x 2.17 x 11.02 inches Package Contents: 1 x MIC System, 2 x Wireless Microphone, 1 x Connecting Cable, 1 x Power Adapter, 1 x English User Manual100% Hot and High QualityWe will carefully test every item before shipment.Notes:Due to manual measurements, please allow an error of 1-3 cm.Due to problems between different monitors, the image may not reflect the actual color, please refer to the actual product.If there is a problem with the product, please contact us.Thank you for understanding.FEEDBACK:1.If you are satisfied with our products and services,please leave your postive feedback and 5 stars.2.If you don't satisfied our products,pls contact us before you leave negative feedback.we guarantee we will 100% slove any problem for you and make you satisfied.SERVICE:1.We care about our valued customers,and will always try to help you,hope to establish long business with you.2.Please contact us by Jumia Customer service before leaving any negative feedback or opening and dispute on the site. Please give us the opportunity to resolve any problem.Thank you.