“Let our rigorous testing and reviews be your guidelines to A/V equipment – not marketing slogans”
Facebook Youtube Twitter instagram pinterest

Bluetooth Headphones - Bluetake i-Phono BT420EX Review

by February 02, 2005
BlueTake BT420EX Wireless Headphones

BlueTake BT420EX Wireless Headphones

  • Product Name: i-Phono BT420EX Bluetooth Headphones
  • Manufacturer: Bluetake
  • Performance Rating: StarStarStarhalf-star
  • Value Rating: StarStarStar
  • Review Date: February 02, 2005 19:00
  • MSRP: $ 249
  • Buy Now

General Radio: Bluetooth Class 2, up to 5~10 meters (in open space)

(The maximum operating range depends on the paired phone model, battery power, and environmental factors.)
Carrier Frequency: 2.402~2.480GHZ
Data Rate: 1 Mbps

Spread Spectrum: FHSS (Frequency Hopping Spread Spectrum)

Modulation Method: GFSK (Gaussian Frequency Shift Keying)

Bluetooth Profile Supported: Advanced Audio Distribution Profile (A2DP) Headset Profile (HSP) , Hands-Free Profile (HFP), Serial Port Profile (SPP)

Auto-switching: While listening music, you can receive or make a phone call with the paired mobile phone

Interface: 30mm stereo speaker

Audio Format: SBC

Antenna: Ceramic antenna

Power Consumption: Tx Typical: 64mA; Rx Typical: 45mA

Sensitivity: < 0.1% BER at -80 dBm

RF Output Power: -6dBm to 4dBm

Input Power: DC 5V 500mA, AC adapter

Power Rating: 1mW (Normal) / 3W (Maximum)
Battery: 3.7V / 600mA / Li-Polymer / Embedded and Rechargeable

Diameter: 30mm
Frequency Response: 20Hz ~ 20KHz
SPL (Sound Pressure Level): 115±3dB @ 1KHz
THD (Total Harmonic Distortion): 5%
Impedance: 32Ω ±15% @ 1V, 1KHz

Listen/Talk Time: 6 hours / 8 hours
(The maximum operating time depends on the usage frequency and environmental factors. A long distance wireless connection and use with a mobile phone will increase the power consumption.)

LED Indicator Status

Blue: Power on mode
Red: Low power or being charged
Blue & Red: Pairing mode
Green: Full charged


Folded: 100mm x 88mm x 77mm
Unfolded: 150mm x 140mm x 75mm
Max. extended ear-to-ear distance: 180mm

Weight: 98g (battery included)


  • Long battery life
  • Excellent charging options
  • Easy to use and connect
  • Simple controls
  • Customizable look


  • Not inexpensive
  • Bulky and cumbersome looking
  • Less than stylish (think Princess Leia)
  • Limited compatibility with cell phones


When I think of wireless headphones several words come to mind: Convenience. Comfort. Hands-free (and care-free) operation. These are the things a wireless set of headphones must achieve to satisfy those who would consider replacing their hard-wired counterparts. Let's face it, wires work, so to replace a traditional format with a wireless one means that the new technology has to integrate in a way that results in a step up - a greater user experience. Then again, we are talking no wires, and that alone might be cool enough to make anyone consider jumping ship to the world of cordless musical goodness.
About the author:
author portrait

Clint Deboer was terminated from Audioholics for misconduct on April 4th, 2014. He no longer represents Audioholics in any fashion.

View full profile

Confused about what AV Gear to buy or how to set it up? Join our Exclusive Audioholics E-Book Membership Program!