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Two systems in one.
The AKG WMS 40 Pro Presenter Dual Hand-Held and Headset System includes the SR 40 Dual reciever, the PT 40 Miniature Transmitter, the C 444 L Head-Worn Microphone, and the HT 40 hand-held microphone transmitter.

The WMS 40 PRO Presenter sets provide optimum intelligibility for actors, presenters, or moderators and an ease of use that lets you focus on what you have to say. The cost efficient Presenter Dual Hand-Held and Headset System is ideal for events with two moderators or that require an audience channel. Transmitters operate up to 30 hours on a single AA battery.

AKG WMS 40 Pro Presenter Dual Hand-Held and Headset Wireless Microphone System Specifications:
SR 40
Carrier frequency range: 710 to 865 MHz, 2 fixed-frequency receivers in single case
Modulation: FM
Audio bandwidth: 40 Hz to 20 kHz
THD: typ. 0,8 % (at 1 kHz)
Signal/noise ratio: typ. 110 dB(A)
Power supply: 120/230 V AC
Audio outputs: bal. 1/4" jack, output level adjustable, at rated deviation: 500 mV rms.
Dimensions: 200 x 190 x 44 mm (7.8 x 7.4 x 1.7 in.)
Net weight: 647 g (1.4 lbs.)

PT 40
Carrier frequency range: 710 to 865 MHz, 1 fixed frequency
Modulation: FM
Audio bandwidth: 40 Hz to 20 kHz
THD: typ. 0,8 % (at 1 kHz)
Signal/noise ratio: typ. 110 dB(A)
Power supply: 1 AA size battery
RF output: typ. 10 mW (ERP)
Battery life: typ. 30 h (for 2200 mAh)
Dimensions
60 x 74 x 30 mm (2.4 x 2.9 x 1.2 in.)
Net weight: 60 g (2.1 oz.)

C 444 L
Polar pattern: cardioid
Frequency range: 20 to 20,000 Hz
Sensitivity: 40 mV/Pa (-28 dBV)
Max. SPL: (k=1%) 126 dB
Equivalent noise level: 22 dB-A
Signal/noise ratio (A-weighted): 72 dB
Impedance: 200 ohms
Recommended load impedance: >2000 ohms
Supply voltage: 1-10 V
Current consumption: <2 mA
Connector: C 444 L: 3-pin mini XLR
Cable: 1.5 m (5 ft.)
Finish: matte black
Dimensions: 145 x 110 x 70 mm / 5.7 x 4.3 x 2.8 in.
Net weight: C 444 L: 30 g / 1.1 oz.
Shipping weight: C 444 L: 200 g / 7.1 oz.

HT 40
Carrier frequency range: 710 to 865 MHz, 1 fixed frequency
Modulation: FM
Audio bandwidth: 65 Hz to 20 kHz
THD: typ. 0,8 % (at 1 kHz)
Signal/noise ratio: typ. 110 dB(A)
Power supply: 1 AA size battery
RF output: typ. 10 mW (ERP)
Battery life: typ. 30 h (for 2200 mAh)
Dimensions: 229 x 53 dia. mm (9 x 2.1 in.)
Net weight: 195 g (6.95 oz.)

AKG WMS 40 Pro Presenter Dual Hand-Held and Headset Wireless Microphone System Features:
SR 40
Two receivers in a single case minimize space requirements and cost
All-metal case
Multichannel capability for simultaneous use of up to seven channels (maximum number of channel depends on local frequency plans)
High Definition Audio Performance technology ensures the legendary, realistic AKG sound and perfect audio transmission

PT 40
Miniature transmitter
Single-battery powering
Multichannel capability for simultaneous use of up to seven channels (maximum number of channel depends on local frequency plans)
High Definition Audio Performance technology ensures the legendary, realistic AKG sound and perfect audio transmission
Transmitter operates for at least 30 hours off a single AA size battery, saving cost, maximizing dependability, and minimizing onstage stress

C 444 L
Ergonomically optimized behind-the-neck headband
Moisture shield
External shock mount for high mechanical-noise rejection

HT 40
High Definition Audio Performance technology ensures the legendary, realistic AKG sound and perfect audio transmission.
Transmitter operates for at least 30 hours off a single AA size battery, saving cost, maximizing dependability, and minimizing onstage stress.
Single-battery powering
Multichannel capability for simultaneous use of up to seven channels (maximum number of channel depends on local frequency plans).