MDR-IF245RK Main Specifications 【Transmitter TMR-IF245R】 Modulation Method: Frequency Modulation Carrier Frequency Right Channel: 2.8 MHz Left Channel: 2.3 MHz Frequency Response: 10Hz~20,000 Hz Audio Input Terminals: RCA jack / Stereo mini-jack Power Supply: DC 12V (using the included AC adapter) Maximum External Dimensions: Approximately 140 x 60 x 105 mm (width/height/depth) Weight: Approximately 200g 【Headphones MDR-IF245R】 Type: Open-air dynamic Driver Unit: 40mm diameter Frequency Response: 10Hz~24,000 Hz Power Supply: Included rechargeable nickel-metal hydride battery BP-HP550-11 or separately sold AAA batteries Weight: Approximately 200g (including the included rechargeable nickel-metal hydride battery) The included headphone covers have deteriorated, so I have been using the ones in photo 6. They have been home-cleaned. I will also include these 4 covers. It seems that the covers are also sold separately, so please check. This is a set of two headphones. How about watching movies or listening to music with someone? ^ ^ Volume can be adjusted individually. Please understand that this is a used item. I am decluttering, so I would appreciate it if you could purchase it as soon as possible♪ Instant purchase is welcome. I try to ship as quickly as possible. If you have any questions, Please feel free to comment.