The F9 that looks after your phone as well as your ears: IPX7 Bluetooth 5.3 buds riding in a 2,000mAh case with an LED readout and a charge to spare.
Long day, phone in the red, an hour of travel still ahead. The Volt Plus Tech F9 with its 2,000mAh case is built for exactly that. The buds charge inside it, and whatever the case has left can flow to your phone.
Think of it as two gadgets in one pocket. A pair of IPX7 Bluetooth 5.3 buds, and a small power bank that happens to hold them.
Be realistic about phone charging. A 2,000mAh cell loses a share to voltage conversion and heat on the way to a phone. Figure on very roughly 25–35% of a typical 4,000–5,000mAh phone, depending on the phone and how full the case starts.
That is not a full recharge. It is enough for maps home, a ride-hailing app and a call to say you are late. For most days, that is all a spare needs to do.
With the case in play, Volt Plus Tech quotes 24–26 hours of listening. That figure assumes the case spends its charge on the buds alone. Charge the phone from it and the total drops.
The buds refill fast, too. Volt Plus Tech rates a bud charge at about 30 minutes, so a coffee stop is enough to bring them back for the second half of the day.
| Spec | Value |
|---|---|
| Model | F9 (Volt Plus Tech) |
| Bluetooth | 5.3 |
| Rated range | 33 ft (about 10 m) |
| Case battery | 2,000mAh power bank |
| Battery display | LED level for case and buds |
| Playtime with the case | 24–26 hours (maker's figure) |
| Bud charge time | About 30 minutes (maker's figure) |
| Water rating | IPX7 |
| Call processing | CVC 8.0 noise reduction |
| Controls | Touch: previous, next, volume, voice assistant |
| Driver | Dynamic, 8D bass tuning |
| Impedance | 25.94 ohm |
| Sensitivity | 103 dB |
| Case size | 2.7 × 1.3 × 1.2 inches |
| Case weight | 2.1 ounces |
| Charging | USB-C |
| In the box | 2 buds, power-bank case, charging cable, 3 ear-tip sizes, instructions |
| Works with | Android, iPhone, Mac, Windows |
| Warranty | 1-year limited |
| Colours | Black, white |
This F9 turns up under a long list of phone names: Galaxy A53, A15 and S25, Moto G and Razr, iPad Air, Kyocera DuraForce, Fairphone 5, Poco X6 Pro and more. The name changes; the buds and the 2,000mAh case do not.
Those names help people searching for earbuds for their exact phone. They do not signal a special build. The Volt Plus Tech F9 pairs with Android phones, iPhones, Macs and Windows machines over standard Bluetooth audio.
| Choice | What changes |
|---|---|
| Black case | Colour only |
| White case | Colour only |
| Phone name on the box | Nothing inside |
So pick by colour, not by phone. Black hides scuffs from keys and coins. White looks sharp next to a pale phone and is easy to spot in the depths of a dark bag.
Pairing takes a minute the first time. Lid up, buds out, let them power up and find each other, then pick them on your phone. Volt Plus Tech describes automatic power-on and pairing when the buds come out. The walkthrough for each phone type is in pairing F9 earbuds.
Inside the box: two buds, the power-bank case, a charging cable, three sizes of ear tips and the instructions. Try all three tip sizes before deciding one is loose.
A 1-year limited warranty from Volt Plus Tech covers the set, a longer promise than many no-name F9s carry.
Calls are where cheap buds usually fall apart. Volt Plus Tech fits CVC 8.0, a noise-reduction step that trims background sound off your voice before your caller hears it.
It will not erase a gale. It does take the edge off traffic, crowds and gym music. Put the wind behind you and speak normally, and the other side hears you, not the car park.
Tap counts for each gesture are in the F9 touch-control manual. Learn the volume gesture first; it is the one you need mid-run.
IPX7 keeps sweat and rain out of the buds. On paper the buds can sit a metre under water for half an hour, so wet trail runs and dripping gym sessions barely test them. Salt, chlorine and hot water are different stories, so rinse and dry after the beach.
Sound is tuned bass-first, which Volt Plus Tech calls 8D stereo. Sensitivity is rated at 103 dB and impedance at 25.94 ohm, so a phone drives them loud without effort. Keep the volume sensible on long sessions.
Buds silent on one side or paired as two devices? A reset clears it, and the F9 reset steps cover the holds.
Three F9s cover most bags. Choose by what you care about most: your phone, your pocket or your bass.
| Pair | Case | Phone top-up | Bluetooth |
|---|---|---|---|
| Volt Plus Tech F9, 2,000mAh | Power bank, LED | Yes | 5.3 |
| Volt Plus Tech F9 Mini | Slim, no power bank | No | 5.3 on most |
| MDNS BTH-F9-5 | 2,000mAh, LED | Not stated | 5.0 |
| BSWLMDD F9 | 1,200mAh, percentage | Emergency only | 5.3 |
Pick this one when the phone battery is the weak link of your day. Pick the Mini when the case must vanish in a pocket. Pick the MDNS for 8mm drivers on a matte F9-5.
Weight tells the story. At 2.1 ounces the case is light for a power bank and sits flat in a jacket or the front pocket of a bag. Against the Mini, the trade is thickness, not heft.
Travelling light for a day trip? Leave the separate power bank at home. The F9 case covers the buds all day and keeps a reserve for the phone: one gadget and one cable instead of three.
Every F9 case size and what it buys is laid out on the F9 price breakdown, and the habits that keep a power-bank case healthy sit in the F9 charging walkthrough.
Plan on a partial top-up, very roughly 25–35% of a typical 4,000–5,000mAh phone; conversion losses and the case's own charge level move it.
No. The Galaxy, Moto, iPad and other names are for search; every version is the same F9 and works with any Bluetooth phone, tablet or computer.
Yes, to IPX7. Downpours and sweat-soaked sessions are covered; laps in the pool and steamy showers are not.
With the case in play, Volt Plus Tech quotes 24–26 hours of listening. Charging a phone from the case shortens that.
Two buds, the 2,000mAh power-bank case, a charging cable, three sizes of ear tips and instructions, with a 1-year limited warranty.
