Plantronics Discovery 655 is a Bluetooth headset with weighs only 9 grams and comes with an innovative charging system and secure carrying pocket that provides up to 10 hours of talk time using the optional AAA battery charger, and includes a unique vibrate ring indicator. Features include Digital Signal Processing for crystal clear sound.
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CNET has a review of the BlueAnt Wireless X3 micro and writes – “On the back of the headset is an earbud that rests in the ear canal for a more secure fit. The headset comes with an optional ear hook, which you can adjust to fit over either ear, and removable foam earbud covers [...]

# High fidelity stereo sound for superior audio performance
# Up to 12 hours talk time and up to 10 hours audio listening time
# Universal adapter plugs directly into most 3.5 mm audio devices, such as iPods, to enjoy wireless stereo listening
# Seamlessly switch between calls and music listening
# Telescoping voice tube provides clear calls and [...]

# Stylish, compact intelligent design
# Weighs less than one-third ounce (10 grams) and measures less than one and a half inches in length (4 centimeters)
# Digital sound enhancement via DSP technology
# Automatic volume control
# One-touch pairing button
# Multi-colored LED lights for status on Bluetooth, battery and charging
# Voice dial, call hold/call wait, last number re-dial, [...]

# Weight: 0.8 ounces
# Total Device Dimensions (including earhook): approximately 2.75″ tall x 3″ wide x 1″ thick
# Up to 5 hours talk time (Up to 8 hours when used with HV3 mode)
# Up to 120 hours standby time
# Display: OLED digital display; 64×48 pixel screen
# Rechargeable lithium polymer battery located in earhook
# Uni-directional microphone
# [...]

# Bluetooth Specification v1.2 Class 2
# Headset, Handsfree, A2DP Profiles and AVRCP Profiles
# 3.5mm audio jack for customized earphone
# Internal Buzzer
# Unique remote control button
# Talk Time*: 6 Hours
# Music Playing Time*: Up to 6 Hours
# Stanby Time*: 150 Hours

Mobilemag review:
Supporting both mono and stereo mode, the controller portion clips onto wherever you’d like (doubling [...]

CNET has a review of the Nokia BH-800 and writes – “The Nokia BH-800 is a tiny little headset that looks like a piece of candy, measuring only 1.6 by 0.7 by 0.35 inches and weighing an airy 0.3 ounce. Because it’s so tiny, it’s inconspicuous when worn, a far cry from most other Bluetooth [...]

Infosyncworld has a review of the Nokia BH-800 and writes – “As much a fashion accessory as it is a headset, Nokia’s BH-800 mono Bluetooth headset puts on a good show despite its compact size. Its mediocre range and average battery life are likely both consequences of its design, while the rubber-encircled speaker insert is [...]