Omnidirectional Lavalier Wireless Microphone System Experience the advantages of crystal clear sound with the ALS-216 Personal Trainer. Used by top equestrian trainers and riders all over, this system allows trainers to communicate with riders over long distances with perfect speech clarity. Simple to use, the trainer wears the M-216 personal transmitter and lapel microphone, and the rider wears the PR-216 personal receiver and earphone. The rider can be as far away as 300 feet and not miss a single word. What's more, with additional receivers, multiple reders can monitor the trainer at the same time. Plus, its rugged construction ensures long-lasting durability in even the most demanding environments. The Complete ALS-216 System Includes: 1 x M-216 Option 1 Transmitter (Includes mic mute switch) 1 x CM-183 RT Omni-directional Lapel Microphone 1 x PR-216 Personal Receiver 1 x MDR-J10 Left & Right Mono Headphone Set 2 x BC-216 Snap-on Belt Clip 1 x C-216 Carrying Case Specifications: Audio Input: Microphone input impedance for electret type microphone - 3k ohm Aux/Line input impedance - 10k ohm at 0 dB nominal Connector: Microphone - Micro-mini 2.5 mm mono (locking or non-locking) Auxiliary - Mini 3.5 mm Stereo - Audio - Tip and Sleeve - Battery Charging - Tip and Sleeve - External 9V power - Ring and Sleeve Controls and Indicators: Power On/Off switch Synthesized channel selection switches Microphone mute switch (Optional) Audio input gain control Modulation voice level indicator Antenna System: Body-worn microphone cord or whip antenna plugged directly into microphone connector when auxiliary input it used Frequency Response: 80 Hz to 10 kHz Modulation: 5 kHz deviation Ch. 1-40 (non-companded) 10 kHz deviation Ch. 41-60 companded RF Power Output: 10 mW to the antenna system Out-of-Band Emissions: Better than 45 dB below carrier Current Drain: 17 mA constant current Weight: 4 ounces (110 grams) Battery: 9 V alkaline for up to 35 hours of operation 9 V Nickel-Metal Hydride rechargeable for up to 15 hours of operation Dimensions: 1 1/6" x 2 1/2" x 3 1/4" (27 mm x 57 mm x 83 mm) PR-216 Audio Output: Headset output +16 dBu (low impedance) Connector: Stereo/mono 3.5 mm audio output connector Indicators: LED Power/Battery indicator Controls: Power On/Off switch Volume control (50 dB range) 99-position rotary channel selector switches Audio Frequency Response: 80 Hz to 12 kHz Harmonic Distortion: Less than 1% (80% modulation) Operating Radio Frequency: 216-217 MHz Frequency Stability: 0.002% frequency synthesized crystal controlled RF Sensitivity: 0.5 uV for 12 dB SINAD Adjacent Channel Rejection: 65 dB 50 kHz off-channel Spurious Rejection: 60 dB (image excluded) Ultimate Quieting: Better than 95 dB Companded Channels Deviation Acceptance: Up to 10 kHz Antenna: Integral with output cable Current Drain: 15 mA nominal Power Requirements: 9 volt alkaline battery or rechargeable nickel metal hydride Dimensions: 1 1/6" x 2 1/2" x 3 1/4" (27 mm x 57 mm x 83 mm)