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Runner 40

Runner 40

182 total reviews

Designed by runners for runners! Incredible sound in a small, secure bud

Certified carbon neutral
1-Year Warranty
Regular price $39.99
Regular price Sale price $39.99
Sale Sold out

  • Built For Athletes: Our hook design keeps the earbuds securely in your ears. Focus on your workout, not your earbuds
  • Great For Small Ears: These earbuds are made to adapt to ears of all sizes
  • Waterproof: Power through rain, sweat, and even showers. The earbuds use internal nano-coating to create IPX7 waterproofing.
  • 30 Hours of Battery Life: Months of workouts on one charge! The earbuds can play 6 hours of music, and the charging case can power 24 more hours!
  • Bass Mode: Easily switch between Back Bay's Signature Sound and our new Bass Mode
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Customer Reviews

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  • BT Version: 5.2
  • Driver Sensitivity: -42±1dBA
  • Output Maximum: 10mW
  • Impedance: 25±15%Ω 
  • Total Harmonic Distortion: 100Hz-5600Hz≦5%
  • Codecs Supported: SBC/AAC/MP3
  • Profiles Supported: SBC, HSP, HFP,AVRCP,A2DP
  • Frequency Range: 20Hz-10KHz
  • Driver Size: Φ10mm
  • Frequency Band: 2402 - 2485 mHz
  • Wireless Range: 30 Feet
  • Microphone Type: Environmental Noise Cancellation, omni directional
  • Microphone Sensitivity: -42±1dBA
  • Waterproof Rating: IPX-5
  • Battery Type: Lithium Ion
  • Battery Voltage 3.7 V
  • Maximum total playtime with charging case: 22 hours
  • Charging Case Recharges Earbuds 3 times on a Single Case Charge
  • Earbud Playtime without ANC: 5.5 hours
  • Earbud Platime with ANC: 4.5 hours
  • Total Playtime with Charging Case:
  • Recharge Time: About 2 Hours
  • Earbud Battery Capacity: 40 mAh
  • Charging Case Battery Capacity: 320mAh
  • Charging Port: USB-C