The Hamilton Electronics ALS600 breaks down hearing barriers by delivering superior sound quality and value for money in Assistive Listening Systems. Get everyone in on the listening experience and ensure ADA compliance at any large venue with our system. A single transmitter can serve an unlimited number of receivers in a 300 foot radius.Popular applications include:• School Auditoriums• Houses of Worship• Concert Venues• TheatersALS600 System includes (6) receivers, (6) ear buds, (1) transmitter, (1) carry case (batteries included).ALS600 System SpecificationsOverall System PerformanceFrequency Response: 100Hz-8kHz, +- 3dBSignal to Noise Ratio: 41 dBTotal Harmonic Distortion: < 0.5%RF Frequency: 75.5 MHzFrequency Stability: Better than .005%Operating Range: Up to 300 feet line-of-sightTransmitterMic Input: 1/4" Phone jack, unbalanced with 12V DC at 1 mA for condenser micLine Input: 1/4" Phone jack, impedence: 100K unbalancedPower Input: 15dBmControls: Power on/off, audio input gain adjustmentIndicators: Power On LED, Audio modulation LEDAntenna: Permanently mounted telescoping whip antennaPower Requirement: 12V DC regulated at 300 mADimensions: 1.25" x 8.25" x4.25"Weight: 2.6 lbs.ReceiverControls: Separate volume & power controlsAudio Output: 109 mW max into 16 ohmsConnectors: 3.5mm mono mini jack for earphone outputEarphones: Mini binaural earbudsAntenna: Integral with earphone cordIndicators: LED power on indicatorSensitivity: 3 uV for 12dB Sinad with squelch defeatedMute Threshold: 5-8 uVPower Requirements: 9V AlkalineBattery Life: 17-20 hours w/alkaline batteryDimensions: 3.35" x 2.75" x .75"Weight: 2.65 oz. without battery