📘 KOSS manuals • Free online PDFs

KOSS Manuals & User Guides

Koss Corporation is a legendary American audio company specializing in high-fidelity stereophones, wireless headphones, and headsets for audiophiles and professionals.

Tip: include the full model number printed on your KOSS label for the best match.

KOSS Support

Official site: https://koss.com
General support: https://koss.com/pages/support
Warranty & registration: Warranty info
Support phone: 1-800-872-5677
Support email: support@koss.com
Contact form: Contact manufacturer support

KOSS manuals

Latest manuals from manuals+ curated for this brand.

Koss Plug Wireless Bluetooth Headset User Manual

User Manual

User manual for the Koss Plug Wireless Bluetooth headset, detailing operation, controls, LED indicators, charging, safety precautions, technical specifications, and compliance information. Includes FCC and CE declarations.

Koss Lifetime Limited Warranty for Headphones - QZ-99

Warranty Certificate

Understand the Koss Lifetime Limited Warranty for headphones, including coverage details, how to claim, exclusions, and contact information for models like the QZ-99 Noise Reduction Stereophone.

Koss BT115i Bluetooth Headset: User Guide and Specifications

instruction manual

Comprehensive user guide for the Koss BT115i Bluetooth Headset, covering pairing, controls, charging, safety, and technical specifications. Learn how to connect and use your Koss wireless earbuds.

Koss Lifetime Limited Warranty - Coverage, Claims, and Exclusions

Warranty Certificate

Detailed information on the Koss Lifetime Limited Warranty, including what is covered, how to make a claim, exclusions, and legal rights. Contact information for Koss repair and support.

Koss Plug Wireless Bluetooth Headset User Guide

User Manual

User guide for the Koss Plug Wireless Bluetooth headset. Learn how to pair, control playback, charge, and understand indicator lights. Includes safety and compliance information.

Koss BT539i Bluetooth Wireless Headphones User Manual

User Manual

Concise user guide for the Koss BT539i Bluetooth wireless headphones, detailing setup, pairing, controls, charging, safety precautions, and technical specifications.

Koss Porta Pro Wireless Bluetooth Headphones User Manual and Specifications

User Manual

Official user manual and technical specifications for the Koss Porta Pro Wireless Bluetooth headphones, covering setup, controls, safety, and compliance information.

KOSS TWS250i True Wireless Earbuds User Manual

User Manual

Explore the KOSS TWS250i True Wireless Earbuds. This guide covers pairing, Bluetooth connection, touch controls, charging, reset procedures, product specifications, and important safety warnings.

Koss KPH7 Wireless Bluetooth Headset: Pairing, Controls, and Safety Guide

Quick Start Guide

Official guide for the Koss KPH7 Wireless Bluetooth Headset. Learn how to pair, use controls, charge, and understand safety and compliance information.

Koss EQP1/EQP2 Portable Amplifier with Sportclip Stereophones User Guide

user manual

User guide for the Koss EQP1 and EQP2 portable amplifiers, detailing setup, operation, components, warranty, and safety information for enhanced audio experiences.

Koss Product Warranty Information and Claim Procedures

Warranty Information

Detailed warranty information for Koss headphones and accessories, including limited lifetime, 90-day, and one-year warranties, claim procedures, coverage, and exclusions.

Koss Headphones Warranty and Repair Guide

guide

Comprehensive guide to Koss headphone warranty, repair procedures, contact information, and product support, including details on limited lifetime, 90-day, and one-year warranties.

KOSS manuals from online retailers

Koss Porta Pro Communication Headset Instruction Manual

PORTA PRO COMM. HEADSET • March 10, 2026

Official instruction manual for the Koss Porta Pro Double-Sided Communication Headset. Learn about setup, operation, maintenance, troubleshooting, and specifications for model PORTA PRO COMM. HEADSET.

Koss ESP-950 Electrostatic Stereophone User Manual

ESP950 • March 4, 2026

Comprehensive user manual for the Koss ESP-950 Electrostatic Stereophone, covering setup, operation, maintenance, troubleshooting, and specifications.

Koss Porta Pro Wireless Bluetooth On-Ear Headphones Instruction Manual

Porta Pro Wireless (Model 193582) • February 25, 2026

Comprehensive instruction manual for the Koss Porta Pro Wireless Bluetooth On-Ear Headphones (Model 193582), covering setup, operation, maintenance, troubleshooting, and specifications. Features include Bluetooth 4.1 with apt-X, 12+…

Koss TWS250i True Wireless Earbuds Instruction Manual

TWS250i • February 22, 2026

Official instruction manual for Koss TWS250i True Wireless Earbuds, covering setup, operation, maintenance, troubleshooting, specifications, and warranty information.

Koss BTS1 Bluetooth Speaker User Manual

BTS1 • February 17, 2026

Instruction manual for the Koss BTS1 Bluetooth Speaker, covering setup, operation, maintenance, troubleshooting, and technical specifications.

Koss QZ-99 Noise Reduction Stereophone Instruction Manual

QZ99 • February 10, 2026

Instruction manual for the Koss QZ-99 Noise Reduction Stereophone, covering setup, operation, maintenance, and specifications for optimal audio isolation.

Koss Porta Pro Utility On-Ear Headphones Instruction Manual

Porta Pro Utility • January 16, 2026

Instruction manual for the Koss Porta Pro Utility On-Ear Headphones, covering setup, operation, maintenance, and specifications.

Koss BT221i Wireless Bluetooth Ear Clip Headphones Instruction Manual

BT221i • January 10, 2026

Comprehensive instruction manual for the Koss BT221i Wireless Bluetooth Ear Clip Headphones. Learn about setup, operation, maintenance, and specifications for your sweat-resistant headphones with in-line microphone and remote…

Koss CS300-USB Double-Sided On-Ear Communication Headset User Manual

CS300-USB • January 2, 2026

Official user manual for the Koss CS300-USB Double-Sided On-Ear Communication Headset, providing detailed instructions for setup, operation, maintenance, troubleshooting, and specifications.

Koss KD250 DVD Player User Manual

KD250 • December 29, 2025

Comprehensive instruction manual for the Koss KD250 DVD Player, covering installation, operation, maintenance, troubleshooting, and technical specifications.

Koss SB45-USB Multimedia Stereo Headphone User Manual

SB45-USB • November 26, 2025

Comprehensive user manual for the Koss SB45-USB Multimedia Stereo Headphone, providing setup, operation, maintenance, and troubleshooting information.

Koss SB40 Computer Headset with Microphone Instruction Manual

SB40 • November 18, 2025

Comprehensive instruction manual for the Koss SB40 Computer Headset, covering setup, operation, maintenance, troubleshooting, and specifications for optimal performance.