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The general trademark of a manufacturer by which the consumer knows its products. A manufacturer can have multiple brand names. Some manufacturers license their brand names to other producers.
Product name:
Product name is a brand's identification of a product, often a model name, but not totally unique as it can include some product variants. Product name is a key part of the Icecat product title on a product data-sheet.
Product code :
The brand's unique identifier for a product. Multiple product codes can be mapped to one mother product data-sheet if the specifications are identical. We map away wrong codes or sometimes logistic variants.
Category :
Headphones come in all sorts of designs and qualities, so you will surely be able to find your perfect pair in our database!
Data-sheet quality: created/standardized by Icecat
The quality of the product data-sheet can be on several levels:
only logistic data imported: we have only basic data imported from a supplier, a data-sheet is not yet created by an editor.
created by Sony: a data-sheet is imported from an official source from a manufacturer. But the data-sheet is not yet standardized by an Icecat editor.
created/standardized by Icecat: the data-sheet is created or standardized by an Icecat editor.
Included since: 07 Mar 2007
The date Icecat noticed for the first time that this product was included in the price list of a channel partner
Info modified on: 11 May 2016 15:41:49
The date of the most recent change of this product data-sheet in Icecat.
Product views: 52102
This statistic is based on the 61836 using ecommerce sites (eshops, distributors, comparison sites, ecommerce ASPs, purchase systems, etc) downloading this Icecat data-sheet since 07-03-07 Only sponsoring brands are included in the free Open Icecat content distribution as used by 60195 free Open Icecat users .
Long product name Sony MDR-RF840RK:
The short editorial description of Sony MDR-RF840RK
MDR-RF840RK - Wireless headphone system with long battery life and 100m range

Marketing text Sony MDR-RF840RK

The official marketing text of Sony MDR-RF840RK as supplied by the manufacturer
- Transmission range up to 100m allowing the freedom to move about at your leisure.
- 40mm driver units for deep bass response.
- Hassle-free recharging by placing the headphones on the dock (headphone charged via electromagnetic induction).
- Automatic On/Off for headphones making your batteries last longer.
- Rechargeable Battery will keep the music going.
- Battery playback time up to 15 hrs with rechargeable batteries or 28 hrs with Sony Alkaline batteries.
- Rotary Volume Control on Headphones.
Short summary description Sony MDR-RF840RK:
This short summary of the Sony MDR-RF840RK data-sheet is auto-generated and uses the product title and the first six key specs.
Sony MDR-RF840RK , Circumaural, Black, 20 - 20000 Hz, RF, 112 x 245 x 310 mm, ferrite
Long summary description Sony MDR-RF840RK:
This is an auto-generated long summary of Sony MDR-RF840RK based on the first three specs of the first five spec groups.
Sony MDR-RF840RK . Ear coupling: Circumaural, Headphone frequency: 20 - 20000 Hz, Driver unit: 4 cm. Connectivity technology: Wireless, Wireless range: 100 m. Battery life (max): 28 h, Battery technology: Nickel-Metal Hydride (NiMH), Battery type: AAA. Colour of product: Black. Weight: 300 g
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Ear coupling*
Ear coupling describes the way in which headphones or earphones stay attached to, or inside, the ear. There are three common types of ear coupling: circumaural, supra-aural and intra-aural. Circumaural headphones enclose your ears with large pads that suppress external noise. Supra-aural headphones are typically more lightweight and sit on top of the ears with small pads. Intra-aural headphones come in two basic designs and neither style sits on the head itself. The first are ear buds, which sit just outside of the ear canal, on top of your ear lobes. The second type is actually inserted directly into the ear canal and offers some external noise suppression.
Headphone frequency*
The range of frequencies (low to high sounds) that the headphones can produce.
20 - 20000 Hz
Driver unit
4 cm
Magnet type
Type of magnet e.g. neodymium.
Ports & interfaces
Connectivity technology*
Wireless range
100 m
Battery life (max)
Maximum battery life. Mobile Mark™ (2002) is the standard often used to benchmark battery life time.
28 h
Number of batteries supported
The number of batteries that can be used with the product.
Battery technology
The type of battery in the device, e.g. nickel–cadmium (NiCd).
Nickel-Metal Hydride (NiMH)
Battery type
Description of battery supplied with the product, such battery form factor (e.g. AA/AAA).
Colour of product *
The colour e.g. red, blue, green, black, white.
Weight & dimensions
Weight *
Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
300 g
Other features
Wireless technology
Technology that communicates with other devices without a physical connection e.g. radio, WiFi.
Dimensions (WxDxH)
Dimensions of the product (Width x Depth x Height).
112 x 245 x 310 mm