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Black in-ear earbuds with charging case and LED display

Nerunsa I66 Bluetooth 5.4 In-Ear Earbuds 50H

SKU CH-6C9H-D3AYC

In-ear earbuds with Bluetooth 5.4, 13 mm dynamic drivers, ENC microphones, IP7 waterproofing, 8 hours per charge, 50 hours total with the case.

  • Headphone styleIn Ear
  • Power supplyBattery, true
  • ConnectionNo Jack
  • Wearing styleSingle Ear
  • Cord lengthSilicone earplugs
  • Wireless technologyBluetooth
  • Bluetooth 5.4 cuts latency by 30 ms for smoother video and gaming
  • 13 mm graphene-TPU driver delivers 60 % stronger bass and clearer mids
  • Four ENC microphones filter 80 % of background noise for crisp calls
  • Case extends total playtime to 50 hours with 1.5-hour USB-C recharge
  • Dual LED display shows earbud and case battery levels at a glance

Nerunsa I66 Bluetooth 5.4 In-Ear Earbuds

These wireless earbuds use Bluetooth 5.4 for dual-channel transmission and support HFP, A2DP, HSP, and AVRCP protocols. They deliver Hi-Fi stereo sound through a 13mm dynamic driver with a graphene-TPU composite diaphragm. Built-in ENC noise-cancelling microphones filter out 80% of background noise for clear calls. The IP7 waterproof rating protects against sweat and rain during workouts.

Bluetooth 5.4 connectivity with 15 metre range

The earbuds connect via Bluetooth 5.4, offering a 20% faster connection speed and 25% better stability than Bluetooth 5.3. Latency is lowered by 30ms while power consumption drops by 20%. A single charge provides 8 hours of playback and takes 1.5 hours via USB-C. The charging case extends total playtime to 50 hours, with dual LED digital displays showing remaining battery for both buds and case.

Suits commuters and active users needing long

Ideal for buyers who want extended wireless listening with quick USB-C recharging and visible battery status. Not suited for listeners who prefer wired audio connections or over-ear designs. Buyers needing aptX or LDAC codec support should look elsewhere, as only standard Bluetooth protocols are listed. Those requiring multi-point pairing to two devices simultaneously will not find that feature here.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $22.99
Cheaper than about 55% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameNerunsa
Model nameI66
Product typeIn-Ear
Product colorBlack
Performance
Supported distance15 m
Audio & video
Headphone styleIn Ear
Wearing styleSingle Ear
Connectivity
Wireless technologyBluetooth
Ports & slots
ConnectionNo Jack
Power
Power supplyBattery, true
Battery pack8 h
Run time8 h
Charging time1.5 h
Built-in batteryBattery
Size & build
Cord lengthSilicone earplugs
In the box
In the boxWireless Earbuds, Portable charging box, Silicone earplugs, USB-C charging cable

Questions about this item

What does the 50-hour total playtime actually give me day to day?

The case holds enough charge for several full cycles, so you can listen for 8 hours per charge and recharge the buds multiple times before the case itself needs power.

What does Bluetooth 5.4 change compared with 5.3 on these earbuds?

The 5.4 link connects 20% faster, is 25% more stable, resists interference 10% better, uses 20% less power and cuts latency by 30 ms versus 5.3.

What do I need to charge the case and how long does it take?

A USB-C cable is included and a full case charge takes about 1.5 hours.

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