Bluetooth Headphones - Bluetake i-Phono BT420EX Review

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

Speaker
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

Dimensions

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

Weight: 98g (battery included)