This Shure BLX88 Dual Wireless Replacement Receiver provides improved linearity and frequency response with group and channel scan for easy set-up. Features include microprocessor internal antenna diversity, frequency QuickScan, and two-color audio status indicator LED. Need more info on this product, use this ONLINE FORM to submit your request for more information. Specifications: Working Range: 91 m (300 ft) Line of SightNote: Actual range depends on RF signal absorption, reflection, and interference.Audio Frequency Response: 50 to 15,000 HzNote: Dependent on microphone typeTotal Harmonic Distortion: Ref. 33 kHz deviation with 1 kHz tone 0.5%, typical Dynamic Range: 100 dB, A-weighted, typicalNote: Battery characteristics may limit this range. Dimensions: 4.33 in. X 2.52 in. X 0.83 in. (110 mm X 64 mm X 21 mm) H x W x DWeight:2.6 oz. (75 g)Housing:Molded ABSPower Requirements:2 LR6 AA batteries, 1.5 V, alkalineBattery Life:up to 14 hours (alkaline)