Model  BTR3K Color Available Black
Weight  About 23.5 g(incl. battery) Dimensions About 58×25×11mm (exclusive of back clip)
Audio Input  Bluetooth connection (Bluetooth 5.0 supported) Supported Audio Format(s) AAC/SBC/aptX/aptX LL/ aptX HD/LDAC
Headphone Output 3.5 mm stereo jack Mic Function Support Bluetooth call, built-in omnidirectional microphone; support external microphone of CTIA cable
Balanced Headphone Output 2.5mm jack USB Port Type C USB
Channel Balance  ≤0.1 dB Drive Ability 16~100Ω(PO)
Volume Control Side buttons 16~100Ω(BAL)
APP interconnection Supports setting through App Status Indicator Light RGB light indicates the input Bluetooth audio codec,
charging and working status
Charging Time ≤1.5 h (DC 5V 500mA) Bluetooth Codes Display Supported
Battery Capacity 330 mAh Power Input Recommend DC 5V 500mA
Output Power PO about 25mW(32Ω loaded) Frequency Response 20Hz~20kHz (aptX connection)
PO about 50mW(16Ω loaded)
BAL about 78mW(32Ω loaded) 20Hz~40kHz (LDAC connection)
BAL about 40mW(16Ω loaded)
THD+N PO<0.003%(LDAC 1kHz A-weighted) Output Impedance PO≤0.3Ω(32Ω loaded)
BAL<0.002%(LDAC 1kHz A-weighted) BAL≤0.5Ω(32Ω loaded)
Noise Floor High power model& A-weighted
PO≤1.0uV BAL≤2.0uV
Amplitude PO:0.9V(32Ω /THD+N<1%)
PO:  0.9V (no loaded)
Low Power model & A-weighted
PO≤4.5uV BAL≤4.5uV
BAL: 1.59V(32Ω /THD+N<1%)
BAL: 1.8V(no loaded)
SNR PO≥119dB (32Ω  A-weighted)  
Crosstalk
PO≥ 73dB(1kHz 32Ω loaded)
PO≥ 114dB(1kHz no loaded)
BAL≥122dB(32Ω  A-weighted) BAL≥ 108dB(1kHz 32Ω loaded)
BAL≥119dB(1kHz no loaded)
Sampling Rate Supported Up to 48kHz/16bit(USB DAC)     
Chips Used DAC: AK4377 A* 2  , Bluetooth: CSR8675   Accessories Type C USB charging cable*1, Quick Start Guide*1, Warranty Card*1,Back Clip*1
 Battery Life & Test Conditions (The test result is based on specified test conditions and just for referrence)
Battery Life Low Power model:BAL &P about 11h
High power mode:PO about 9.5H,BAL about 7.5H
Bluetooth Transmitter iPhone (AAC)
Connected Headphones M3 open earbuds(27Ω) Volume With set output at 40mV

Test condition:aptX HD connection, play -5 dB sinusoidal signal, High Gain, 48kHz 20Hz-20kHz, 3.5mm headphone output(32Ω loaded)

Test condition:LDAC connection, play -5 dB sinusoidal signal, High Gain, 96kHz 20Hz-20kHz, 3.5mm headphone output(32Ω loaded)

Test condition:aptX HD connection,play -5 dB sinusoidal signal, High Gain, 48kHz  20Hz-20kHz, 2.5mm balanced output (32Ω loaded)

Test condition: LDAC connection,play -5dB sinusoidal signal, High Gain, 96kHz  20Hz-20kHz, 2.5mm balanced output (32Ω loaded)

Test condition:USB DAC, play -5 dB sinusoidal signal, High Gain, 48kHz 20Hz-20kHz, 3.5mm headphone output(32Ω loaded)

Test condition:USB DAC, play -5 dB sinusoidal signal, High Gain, 48kHz 20Hz-20kHz, 2.5mm balanced output (32Ω loaded)