The COOIDEA Stereo Audio along with a audio supports 1 input 2 output or 2 input 1 and is a AUX audio speaker selector for mobile and 3.5mm Switcher,

【Important Notice for International Buyers – Tomoayax Premium Audio Hi-Fi Japan】

■ Voltage Compatibility This product is designed exclusively for use in Japan (AC 100V, 50/60Hz).

Many regions use 120V or 220–240V. Using this product without a proper transformer in such voltage environments may result in malfunction, overheating, or serious and irreversible damage.

■ Plug Type This product uses a Japanese plug (Type A or B). A plug adapter may be required depending on your region.

■ Transformer Requirement (Very Important) A transformer is required for safe use.

A plug adapter only changes the plug shape and DOES NOT convert voltage. Using this product without a transformer may cause serious and irreversible damage.

■ Buyer Responsibility As this is high-end audio equipment, the buyer is fully responsible for confirming compatibility with their local voltage (100V / 120V / 220–240V) and usage environment before purchase.

■ No Return / No Refund Policy We do NOT accept returns or refunds for: ・Voltage mismatch (including 120V and 220–240V environments) ・Use without a transformer ・Plug incompatibility ・Damage caused by improper setup or usage

■ Liability We are not responsible for any damage, malfunction, or performance issues caused by improper use or incorrect voltage conditions.

■ Final Notice Please ensure full understanding of the above before purchasing. Use only under the correct voltage environment. 【Bidirectional 3.5mm Audio Switch】Plug and play, no power supply required. The 1-input 2-output or 2-input 1-output 3.5mm interface audio selector is designed for easy switching between multiple audio receivers (speakers, headphones, etc.) or audio sources (mobile phones, computers, etc.). 【Metal Case, Small and Exquisite】Small and compact, beautifully crafted with a metal CNC case. It takes up minimal space and is ideal for desktop or office use. 【Low Impedance, High-Fidelity Quality】This audio switcher features a low impedance design that provides high-quality audio reproduction while minimizing cable noise. It also includes a high-quality headphone jack with gold-plated contacts for reliable performance. [One-Press Switch, Easy to Use] By pressing the selection button, you can switch between two playback devices (1x2 mode) or two audio sources (2x1 mode) without having to frequently plug and unplug cables. 【Wide Compatibility, Cable Included】Audio sources: Computers, laptops, mobile phones, audio players, game consoles, etc. Playback devices: Headphones, speakers, audio amplifiers, etc. Applicable to 3.5mm audio interfaces, compatible with both 3-pole and 4-pole (does not support microphone function). A 1-meter audio cable is included with the product. Cooidea's audio switcher is a small, delicate bidirectional switcher for 3.5mm audio interfaces, allowing users to conveniently switch between two audio sources/playback devices. You can connect a common channel to channel 1 or channel 2 with the press of a button. This audio switcher features a low-impedance design that minimizes cable noise while providing high-quality audio playback. It also features a high-quality headphone jack with gold-plated contacts for reliable performance. This device supports the use of a 3-pole headphone jack. When using a 4-pole headphone jack with microphone functionality, audio playback is possible, but the microphone function is not supported. Modes and how to use them: It has a common port and two channels (Channel 1 and Channel 2). There are two operating modes. A. 1x2 mode (1 input, 2 outputs): 1. Connect the audio source (mobile phone, computer, audio player, etc.) to the common port. 2. Connect two audio receiving devices, such as headphones, speakers, or an amplifier input, to Channel 1 and Channel 2, respectively. 3. Press the switch on the switcher to switch the audio output channel. B.2x1 mode (2 inputs, 1 output): 1. Connect two audio sources (such as a mobile phone, computer, or audio player) to Channel 1 and Channel 2, respectively. 2. Connect audio receiving devices such as headphones, speakers, and amplifier inputs to the common port. 3. Press the switch on the switcher to switch audio sources. specification: Color: Black Size: 3.3cm x 2.8cm x 1.3cm Material: Aluminum alloy Weight: 14g