Why does my base transmitter unit power light start flashing after five minutes or so and then turn itself off. I have to change plug locations for power. This is the only item plugged in to that outlet?

Sounds like the base thinks the headset has been turned off, so the base unit shuts itself down. Less likely, there could be a problem with your electrical outlet where it starts shorting after it warms up. However it sounds more likely that there is a problem with the headset base unit or headset itself. I have two and neither does this while the headset is on.

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Sony MDR-RF985RK Wireless RF Headphones - Black

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Wireless 900Mhz w/ over 150 feet of range.
1.57 in neodymium drivers deliver more expressive sound.
Wide, self-adjusting headband for enhanced comfort.
Up to 25 hours battery life.
Frequency Respo

Overview

Specs

Reviews (8)

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Wireless FM headphones for cord-free listening 40 mm driver units for expressive sound Easy-adjust headband for long term comfort Noise reduction system for minimal transmission noise Automatic tuning for optimum signal reception Up to 45 meter (150 feet) reception range 1 Approximate 25 hour battery life 1 Fast recharge: approximately 3.5 hours = full charge 1 Volume control on headphones Easy connection of TV, Hi-Fi, and other components Actual battery life will vary based on product settings, usage patterns, battery and environmental conditions.

Model
Brand	SONY
Model	MDR-RF985RK

Details
Type	Wireless
Color	Black
Driver Unit	40mm
Frequency Response	10Hz-22KHz
Power Supply	5mW + 5mW
Connector	Audio In : Analog Phono Input (left/right), Analog Stereo Input mini jack (x1)
Cord Length	3.28 ft. (1.0 m) Stereo connecting cable
Weight	Headphones: Approximately 10.59 oz. (300 grams) Including supplied batteryTransmitter: Approximately 7.7 oz. (220 grams)
Wireless Type	RF
Operating Time	Battery Charging (Approx): 16H (to fully charge an empty battery); Battery is charged by placing MDR on TMR Battery Life (Approx): 18H (with fully charged supplied NiMH battery pack); 28H (with AAA type alkaline battery)

Features
Features	Cordless Headphones Enjoy high-fidelity sound, at home, in wireless freedom. Long-term comfort The easy-adjust headband allows for long-term comfort and ease-of-use. Expressive sound 40mm drivers deliver deeper bass and audio clarity for a superior home entertainment experience. Quality sound Wireless radio-frequency transmission provides quality indoor transmission. (Up to approximately 150 ft) Fast charging Quick charging your headphones is a breeze with the secure charging system. A 3.5 hour charge will produce a full charge of approximately 25 hours. recharge function. Other specifications Design: Over-the-head, Home-music/movie/games Diaphragm: PET Headband: Wide, Easy-Adjust Magnet: Ferrite Power On/Off: Power turns ON when headphones are worn; Red LED illuminates Type of Use: Home Communication: Wireless Analog 900 mHz Radio Frequency Headphone Type: Closed, Dynamic Audio Audio Modes: Mute: Operates when RF signal is weak or not received Channel Selection: Select by a slide switch Effective Range: Approximately 150 feet (45 m) Transmitter: Ch1: 915.5 MHz, Ch2: 916.0 MHz, Ch3: 916.5 MHz [selective, FM Stereo Tuning: Manual tuning via switch on both base and headphones Volume Control: Yes (Rotary) Battery Type: Rechargeable Ni-MH battery pack (supplied); AAA x2 (not supplied) Internal Power Supply: Transmitter: Supplied AC adapter (12V,200mA) Power Requirements: Rechargeable nickel-metal hydride battery (supplied) or commercially available (size AAA) alkaline batteries

Additional Information
First Listed on Newegg	July 09, 2013

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Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return for replacement within: 30 days
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Sony MDR-RF985RK Wireless RF Headphones - Black

Learn more about the Sony MDR-RF985RK

Customer Reviews of the Sony MDR-RF985RK

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Item#: N82E16826159457

Sony MDR-RF985RK Wireless RF Headphones - Black

Learn more about the Sony MDR-RF985RK

Customer Reviews of the Sony MDR-RF985RK

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info