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back of an N95, with the lens-cover open. The N95 had built-in Wi-Fi, with which it could access the Internet (through an 802.11b/g wireless network). The N95 could also connect to the Internet through a carrier packet data network such as UMTS, HSDPA, or EDGE.
Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control or ANC.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.
Most 2.4 GHz Wireless Headsets come in two units, a wireless headset and a wireless base-station, which connects to your original telephone unit via the handset jack. The wireless headset communicates with the base-station via 2.4 GHz RF, and the voice signals are sent or received via the base unit to the telephone unit.
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The HPA also says that due to the mobile phone's adaptive power ability, a DECT cordless phone's radiation could actually exceed the radiation of a mobile phone. The HPA explains that while the DECT cordless phone's radiation has an average output power of 10 mW, it is actually in the form of 100 bursts per second of 250 mW, a strength comparable to some mobile phones.
Both wired and wireless versions are available and come bundled with Buzz! games. A four-buzzer set acts as a single USB device and connects a USB port on the PlayStation 3. Wireless versions connect via a USB dongle, with each dongle able to support up to 4 wireless buzzers at a time.
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