ADV. (ADVANCED) / Sleeper Loop Black

Sleeper is a sleeping earphone designed for comfortable use while travelling and sleeping. The small silicone-bodied housing provides an excellent fit that does not hurt your ears when you wear it and lie down.

Specifications.
Driver: Full-range dynamic driver
Impedance: 16 Ω +/-15%.
Sensitivity: 100 dB+/-3 dB at 1 kHz
Frequency response: 20Hz ? 40kHz
Rated output: 1 mW
Maximum input power: 5 mW.
Cord length: 1.5m.
Plug: 3.5mm gold-plated plug.
Warranty: 1 year from purchase.