This is Blitzwolf’s sport IEM that features IPX4 water resistances with magnetic ends. The package comes included with a hard carrying pouch, a charging cable, a shirt clip, a cable management tab, 3 pairs of ear-fins and 3 pair of eartips. The ear-fins with the cable management tab does perform well for gym activities and high intensive movements as the earbuds stays in place and cable doesn’t dangle around much. Latest pricing here Amazon/Shopee/Lazada.

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
The accessories
Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
Hard carrying pouch

The controller is located on the right side which it houses the charging port, microphone and the typical 3 array buttons. The buttons does have a tactile bump and are easy to actuate. The sound isolation is great as it blocks a good amount of environmental noise.

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
Cable management

The BW-BTS1 uses Bluetooth 4.1 for connectivity with maximum stable line of sight is up to 11 meters. The rated battery life is 8 hours. Our battery life test is based on the iPhone 6 at 2nd volume bar, lasted us a total 9 hours and 15 minutes. It supports APT-X lossless codec.

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
Shirt clip

TECHNICAL SPECIFICATION

Microphone: Yes
Wired Control: Support
Bluetooth Version: CSR8645 V4.1
Transmission Distance: 10m
Receive Sensitivity: 97dB±3dB
Frequency Response: 20-20kHz
Battery Capacity: 110mAh 3.7,V
Charging Time (h): 1.5h
Talking Time: 7h
Music Time (h): 6-8h
Standby Time (h): 200h

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
With/without eartips

AUDIO QUALITY

POP/EDM:
Tiaan – Be Ok (Low bass frequency)(4th volume)
The low bass frequency is superbly energetic and highly notable, you can feel the air pressure booming in your ears. It doesn’t eat into the vocals and has zero bass distortion. The subtle bass vibrations fades smoothly and the low bass frequency is well bodied. The low bass does overpower the vocals but not in a huge amount, just slightly.

Pia Mia – Do It Again (Standard bass)(5th volume)
The bass is highly energetic and highly notable, you can feel the air pressure. The bass fades butter-smooth at the 2:05 mark. The bass does not overpower the vocal much just by a tiny margin and there is a clear separation between the two. The bass is well bodied while the EDM tones sounds exciting and fun.

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
3 arrays button

Vocals/Instrumentals :
Violinder – Raindrops (High frequency instrumental)(4th volume)
The piano/violin tone sounds right and natural. The tone leans closer to the crystal-clear type not the warm-sounding type. Personally, I prefer crystal-clear type. It has right amount of shine at the high. Tones are well bodied and doesn’t sound half-hearted. The bass/drums does overpowers the piano/violin by a tiny margin in term of audible levels, tho there is clear separation between the two.

Pentatonix – See Through (High frequency vocals/ vocal separation)(5th volume)
Mitch Grassi’s hi-pitched-male Tenor vocals performs very well at the highs with the right amount of shine and it feels bright. Each singer can be identified easily. Every diction and pronunciation is crystal clear. Vocal beat-boxing, echoing and humming is an eargasm, but it does slightly overpower Mitch Grassi’s vocal in the song.

Calvinpixels.com | Calvin Pixels | Blitzwolf BW-BTS1 Review | IPX4 Sport Bluetooth Earphone
You love the magnets?

FINAL VERDICT

The IEM performs well from lows to highs but it’s core strength lies in the mids to high frequency. The best sport IEM under the BlitzWolf so far that we reviewed beating the old version. BlitzWolf took a step forward to improve their audio game this time.

PURCHASE BLITZWOLF BW-BTS1 HERE

Amazon | Shopee (MY) | Lazada (MY/SG)