We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black in-ear wireless earbuds with ear hooks, matte finish

Otium U18 Bluetooth 5.3 in-ear headphones, black

SKU CH-N7J0-RTYG5

In-ear wireless headphones with Bluetooth 5.3, IPX7 waterproofing, sound isolation and up to 16 hours playtime

  • TypeIn-Ear
  • ColorBlack
  • Frequency Response2.4 GHz band (2.4000 GHz–2.4835 GHz)
  • THDIn Ear
  • Power Supplycell, lithium_polymer, lithium_ion, true
  • ConnectorUSB
  • Bluetooth 5.3 delivers a steady wireless link up to 30 feet
  • IPX7 waterproof rating protects against sweat and rain during workouts
  • Sound isolation blocks background noise for clearer audio
  • Up to 16 hours of playback from a 1.5-hour charge
  • Lightweight 0.22-pound design with secure ear hooks stays in place

Otium U18 Bluetooth 5.3 in-ear headphones

The Otium U18 are wireless in-ear headphones built around Bluetooth 5.3 for a stable link to phones, tablets or laptops. Weighing 0.22 pounds, they sit inside the ear canal with silicone hooks that follow the ear curve. An IPX7 rating means they survive heavy sweat and rain during gym sessions or outdoor runs. They suit listeners who want cable-free sport audio without a neckband.

Battery life and wireless range

The built-in lithium-polymer cell delivers up to 6 hours of continuous playback per charge and 240 hours of standby time. A full recharge takes 1.5 hours over the USB connector. Bluetooth 5.3 maintains a reliable connection up to 30 feet from the source device, so the phone can stay in a locker or on a treadmill console. Users needing more than 6 hours of non-stop listening per session will need to recharge mid-day.

Build, fit and daily controls

Silicone ear hooks and an in-ear coupling create a seal that passively isolates sound and keeps the buds secure during vigorous movement. Physical buttons on the housing handle play, pause, track skip and call answering without touching the paired device. A built-in microphone with noise suppression keeps voice clear for calls. The buds show remaining battery status on the connected phone and give a low-battery voice prompt. Buyers who prefer touch controls or a charging case with extra top-ups should look elsewhere.

Highlights

  • Bluetooth 5.3 delivers a steady wireless link up to 30 feet
  • IPX7 waterproof rating protects against sweat and rain during workouts
  • Sound isolation blocks background noise for clearer audio
  • Up to 16 hours of playback from a 1.5-hour charge
  • Lightweight 0.22-pound design with secure ear hooks stays in place

Specifications

BrandOtium
ModelU18, Audio
Part NumberAudio
TypeIn-Ear
ColorBlack
Frequency Response2.4 GHz band (2.4000 GHz–2.4835 GHz)
THDIn Ear
Power Supplycell, lithium_polymer, lithium_ion, true
ConnectorUSB
Ear CouplingSingle Ear
Weight0.22 pounds
Noise Cancellingsound_isolation
Wireless TypeBluetooth
Battery6 hours
Operating Time6 hours
Charge Time1 hours, 1.5 hours
Distance30 feet
Contains Embedded Batterycell
Microphone Frequency Response2.4 GHz
Featuressound_isolation, 5.3, 6 hours, Without Cable, Button Control, Bluetooth, In Ear, dynamic_driver, 30 feet

Questions about this item

Will these U18 earbuds maintain a steady link with my older phone that only supports earlier Bluetooth versions?

The earbuds use Bluetooth 5.3 and connect to any Bluetooth-enabled device up to 30 feet away; the supplier notes a steady connection without dropouts.

How can I confirm the battery status is reporting correctly once I start using the U18?

The remaining capacity of the earbuds appears on the paired phone and a low-battery voice prompt sounds when power runs low.

What accessories come with the U18 and what must I supply myself?

The package includes the IPX7 waterproof in-ear headphones with ear hooks and a USB charging cable; a USB power source for the 1.5-hour charge is not included.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.