COOMAX Mini Hidden Spy Earphone Inductive Wireless Earpiece

COOMAX Mini Hidden Spy Earphone is an ultra-small inductive wireless earpiece that lets you receive voice transmissions discreetly through a neck loop receiver.

This micro-mini magnetic receiver converts electromagnetic induction into clear audio for covert, on-the-go communication. Designed to sit deep in the ear canal, the COOMAX earpiece pairs with an inductive loop that connects to phones, radios, or other audio sources. It suits situations where visible earphones would be impractical, providing lightweight, low-profile listening with hours of battery life.

How does the COOMAX earpiece stay virtually invisible?

The earpiece is extremely small and shaped to tuck into the ear canal so it’s hard to spot when worn. Its anatomical form keeps it stable and comfortable for extended use while the inductive loop handles the wireless connection out of sight.

• Physical dimensions: 5 × 7 × 10 mm for minimal visibility
• Anatomical shape for a snug, concealed fit
• Net weight only 0.8 g to remain undetectable
• Inductive loop transmits audio without bulky transmitters

What devices work with this wireless earpiece?

The COOMAX system uses a magnetic/analogue receiver and an inductive loop that connects to devices with a standard audio jack. It supports phones, FM radios, MP3 players, and many portable devices; adapters may be needed for phones without a headphone jack.

• Compatible with Android phones, tablets, MP3 players, and radios
• Works with Apple devices using a lightning-to-audio adapter
• Connects to any device that accepts a 3.5 mm audio plug
• Includes one inductive loop and one preinstalled SR416SW/337 battery

How long does the battery last and what performance can I expect?

The earpiece uses a small SR416SW/337 cell to keep the receiver compact; expect several hours of operation per battery. Volume is high enough for discreet listening but the device’s RF-based design may produce a faint electrical hiss, so it’s optimized for spoken audio rather than high-fidelity music.

• Battery type: SR416SW/337 (included)
• Typical battery life: 3–5 hours per cell
• Maximum volume rating: up to 110 dB for clear speech
• Small current noise inherent to RF/inductive systems; avoid music playback

How do I use the earpiece safely and get the best reception?

Insert the powered earpiece into the ear canal and place the inductive loop around your neck. Connect the loop to your phone or audio source, then keep clear of large electrical appliances that can cause interference for the cleanest signal.

• Install the SR416SW/337 battery before use and check the faint current sound to confirm operation
• Place the inductive loop around the neck and plug it into your device
• Keep away from computers, speakers, TVs, and refrigerators to reduce noise
• Designed for voice prompts, guided assistance, and discreet two-way communications

Who is this for: The COOMAX Mini Hidden Spy Earphone suits professionals and hobbyists who need discreet, low-profile audio reception — event staff, presenters, tour guides, and students using authorized prompts. It is intended for lawful, ethical uses where visible earphones would be a disadvantage. Not recommended as a high-fidelity music solution due to the device’s inductive design and slight operational noise.