# Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers

Drivers: Monster AC312 Open Ear Headphones are wireless open-ear headphones with a microphone, USB-C charging, and a manufacturer-claimed 32-hour battery life. Their open design suits listeners who want to hear surrounding sounds while listening, though listing details differ on Bluetooth version and protection claims.

- [Original product page](https://best-deals.pro/product/monster-ac312-open-ear-headphones)
- [View offer](https://best-deals.pro/visit/monster-ac312-open-ear-headphones)
- Market: US
- Language: en-US
- Currency: USD
- Brand: Monster
- Model: Ac312 Open Ear Headphones
- Category: Electronics > Headphones
- Price: 29.99 USD
- Previous price: 139.99 USD
- Discount: 79%
- Price checked: 2026-11-14T06:24:39.551Z
- Rating: 5 / 5
- Reviews: 1

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Open-ear placement leaves the ears uncovered, supporting awareness of surrounding sounds while listening.
- The listing describes a microphone with environmental-noise cancellation for calls.
- Manufacturer copy claims up to 32 hours of playtime, but gives no operating-mode conditions.
- A USB-C charging cable is named in the manufacturer’s contents list.

## Pros

- Open-ear design suits listeners who prefer not to seal the ear canal and want ambient sound to remain audible.
- Touch and button controls are both listed, offering more than one stated control method.
- The USB-C charging interface is specified.

## Specifications

### Identity
- Brand: Monster
- Model: Ac312 Open Ear Headphones
- Color: White
### Audio
- Driver type: Dynamic Driver
- Driver size: 16.2 millimeters
- Impedance: 32 ohm
- Frequency response: 20 hertz
- Sensitivity: 105
### Connectivity and controls
- Wireless connection listed: Bluetooth
- Bluetooth version: 5.3
- Bluetooth range: 33 feet
- Control methods listed: Push Button, Touch
- Charging interface: USB Type C
- Headphone jack: 3.5 mm Jack
### Design and dimensions
- Form factor: Open Ear
- Weight listed: 0.09 kg
- Enclosure material: Plastic, Rubber, Silicone
### Materials and protection
- Water resistance listed: Moisture Resistant
### In the listing
- Advertised battery life: 32H Playtime
- Advertised water-resistance rating: IPX5 Waterproof
- Advertised microphone feature: ENC Mic

## Before you buy

- The listing is inconsistent about Bluetooth version: the title and feature copy state 5.4, while the technical details state 5.3. Its IPX5 waterproof and 32-hour claims appear in promotional copy, while the technical water-resistance field says only “Moisture Resistant.” Confirm which specifications apply to the selected item. The 32-hour figure has no stated use mode or conditions.

## In the box

- Headphones (Included)
- USB charging cable (Included)
- User manual (Included)

## A good fit for

- People seeking open-ear headphones for workouts, running, commuting, or music listening while staying aware of nearby sound.
- Buyers who want wireless headphones with a microphone and USB-C charging.

## Less suited to

- Listeners who need a sealed fit or listed active noise cancellation for blocking outside sound.
- Buyers who require a confirmed Bluetooth version, clearly specified water-resistance rating, or battery runtime under a particular listening mode.

## Customer feedback

The supplied evidence contains only one aggregate rating and no written customer feedback. That single top-star rating is too limited to establish dependable customer consensus or identify specific strengths and concerns.

## Frequently asked questions

### Do these headphones block outside noise?
They use an open-ear design, and the listing names no noise control. Its ENC claim refers to the microphone for calls, not stated cancellation of sound for the listener.
### Which Bluetooth version do they use?
The listing conflicts: title and feature text say Bluetooth 5.4, while the technical details say 5.3. Check the selected listing before buying.
### Is the 32-hour battery claim guaranteed for every use?
The listing advertises 32 hours but gives no listening mode or test conditions, so it does not establish runtime for a particular use.
### What is listed in the package?
The manufacturer’s contents list names the headphones, a USB charging cable, and a user manual.

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## Images

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 1](https://best-deals.pro/i/Kf86gjAlmSKI-AVOOTQQmBkj_KfaHjBbEYVcZ2V-OUc1oUwlrfJT6xOSRe4t2Xvqz550ZfojYt1UAiKnIWICI-g2aDiCmOaclmCdIwkIWofqpUkT3xnAP3KW.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 2](https://best-deals.pro/i/LMMRjZ4RHVdrCHLcXR1VkqQrsI_0pz4SagWACL6VC2t4uYUI54UbRsTONv00mOU7SqUPoRjYTIPVY7AD7Kh8OK0fADMHy5zFX7JxQeW1z4SSP1WoorzmpY2T.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 3](https://best-deals.pro/i/OVTxuYyWpNdEoDnsFtaAltc3JYyiWGGwkElhmbun_-z0IW_7lUh8I9vrvMcYNVv5IrnoI4u_tQId0WaPOUnlaq02ajEAjPgNuLanQNsOGFDFa5_8imWsULF4.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 4](https://best-deals.pro/i/rc7QCNT8Nz0-5DXC7hsVII0p2VgiACRlJAGpIZI08FaV70yavW2F5C3S1C6A4RAerdFHEK-qEx-cfH_qsxQyD2JoI8J7t6Y7nP_kMZpXPgep-P0PfeznUAWs.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 5](https://best-deals.pro/i/7gecz7oklCKBh0rrCscOcg5JSrcIMZmCs3GXXnM2T05md86uHTvOBJMgmA-4HEbMvY5MpEPLCqt3wHPhcbgrad2pzkq_yBtN8ik6RvJXbjwsYoZO6xWfN0Xg.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 6](https://best-deals.pro/i/2HVF4SYkp2wy7YRnEGcV3HUuiZSVSX3dxpiXCR57KzTWMjm0ASNYpcot26J2_Z5JYkTYCt4-mkWBRW-3cDhiiJZDDnhSCH5I7GZmmtYMM8O-21jy-oY-HHbp.jpg)

![Monster AC312 Open-Ear Headphones, Bluetooth, 16.2 mm Drivers — 7](https://best-deals.pro/i/n8JNmd1M_8KEEffeaiHrGNbQxotlLJInwyC9PXvTuqnFZFQdYXh27-Aw7kFtiW2K_4qePmzTpu9dOKIG6li7bZ2bYN7TO3N33VIigcwIJ1eLnH51DvvWwtDC.jpg)