RF-509 is newly designed silent RF headphone for sports. Extra light-weight design is suitable for sports, such as running, city walking, spinning bike, yoga, gym. A cute zipper case for easy storage and delivery. It has 3 channels, different color lights are on both sides of headphones to indicate channel selection.

Product Features:
* Open wireless RF stereo headphone system 
* Special mini and light design for sports use like gym, yoga, running, city walking
* Super light weight design
* Led lights to indicate channel selection
* Foldable design and zipper case for easy storage
* Personal volume control on each headphone 
* Soft ear pad for super comfortable wearing 
* Wireless freedom with reception through walls and ceilings 
* Volume and tune controls conveniently located on the headphone 
* Built-in rechargeable Lithium-Polymer battery(include)

Technical Data:

System                                 UHF/RF

Modulation                            FM

Mode                                     Stereo

Channel option                      3 channels or more

Signal-to-noise ration           ＞75dB

THD                                     ＜1%

Speaker                                40mm mylar

Frequency response             30-20,000Hz

Channel separation               ＞35dB

Working time                         10 hours

Charging time                        2-3 hours

Power supply                         Rechargeable lithium-polymer battery (300mAh)