Radius noise canceling ear plug type earphones HP-NLF11 is available in white and black colors. The built in lithium ion rechargeable battery lasts up to 33 hours of continuous use once fully charged. The battery is charged via USB and it takes approximately 2 hours for a full charge. The Radius noise canceling ear plug type earphones HP-NLF11 offer a more compact design, extra comfortable earpieces, full sound, and effective noise-canceling circuitry. You can use the ear phones as ordinary phones without battery. There were only two drawbacks; first, the noise canceling electronics are in a separate corded unit that cannot be disconnected from the headset and it does not come with USB-AC adaptor. The lithium battery is replaced free if it goes dead before guarantee period.
Radius noise canceling ear plug type earphones HP-NLF11 measures 30 x 22 x 60mm and weigh about 38g and is available in Japan for approximately 8,980 yen ($80).