The EarFun UBOOM L is a portable Bluetooth speaker that punches well above its size: two 55 mm drivers with dual passive radiators (28 W in total), EarFun’s JumboBass tuning, an IP67 rating that lets it float in a pool, and up to 16 hours of playtime. It is simple to use, but a couple of features hide behind button combinations, especially stereo pairing and the reset. This guide walks through the setup in the order you will actually need it.
Disclosure: this guide contains affiliate links (Awin). If you buy through them we may earn a commission at no extra cost to you. Specs come from the official product page.
What you need
- EarFun UBOOM L speaker
- The USB-C cable from the box and a 5 V / 3 A USB charger
- A phone, tablet or laptop with Bluetooth
- Optional: a second UBOOM L for stereo
- Optional: a 3.5 mm audio cable for wired sources
Step 1: Charge it fully
Plug the USB-C cable into the speaker and a USB charger (EarFun specifies a 5 V / 3 A input). A full charge takes about four hours and gives up to 16 hours of playback from the built-in 2 × 2,600 mAh battery; real-world runtime depends on volume and the music you play. Give it a full charge before the first outing so the battery indicator is accurate.
Step 2: Pair it over Bluetooth
Power the speaker on and press the Bluetooth button to enter pairing mode. On your phone, open the Bluetooth settings and select EarFun UBOOM L. If your device ever asks for a PIN, type 0000. The speaker uses Bluetooth 5.0 with a range of up to about 15 m without obstacles.
Step 3: Pick a sound mode
The UBOOM L has three DSP sound modes: Indoor, Outdoor and Video. Use the sound mode button to cycle through them. EarFun tunes Indoor for a fuller, bassier sound in a room, Outdoor to spread the music over a wider area, and Video for watching films or clips from a laptop or tablet.
Step 4: Pair two speakers for stereo
With a second UBOOM L you get true wireless stereo. Connect speaker A to your phone first, switch on speaker B, then press and hold the Bluetooth buttons on both speakers for at least three seconds. When both indicators stay blue, speaker A plays the left channel and speaker B the right. Hold the sound mode button for two seconds to switch between stereo and party mode, where both play the same sound.
Step 5: Take it outside
The UBOOM L is rated IP67 dustproof and waterproof, EarFun says it is salt-water resistant, and it floats if it falls in the pool. Rinse it with fresh water after a day at the beach and let it dry before you charge it.
Pro tip
If the speaker refuses to connect, hold Volume + and Volume − together for at least five seconds to clear all pairings, delete EarFun UBOOM L from your phone’s Bluetooth list and pair again. If it freezes completely, hold the power button for eight seconds to reboot it, or press the reset hole on the back with a straightened paper clip.
Hands-free calls: the UBOOM L has a built-in speakerphone, so you can take a call without reaching for your phone. For older devices without Bluetooth, the 3.5 mm AUX input still works.
EarFun UBOOM L Portable Bluetooth Speaker
Portable speaker with two 55 mm drivers and dual passive radiators (2 × 14 W), JumboBass tuning, Indoor/Outdoor/Video sound modes, true wireless stereo pairing, IP67 dust and water protection (it floats), up to 16 hours of playback, USB-C charging, AUX input and hands-free calling. Price on the EarFun US store on 20 October 2026: $79.99 (list price $99.99). Prices change, so check before you buy.
FAQ
How long does the EarFun UBOOM L battery last?
EarFun rates it at up to 16 hours of playback, depending on volume and content. A full charge takes about four hours.
Is the UBOOM L waterproof?
Yes. It is rated IP67 dustproof and waterproof, it is salt-water resistant according to EarFun, and it floats.
Can I connect two UBOOM L speakers?
Yes. Pair the first speaker to your phone, then hold the Bluetooth buttons on both speakers for at least three seconds to create a true wireless stereo pair.
How do I reset the EarFun UBOOM L?
Hold Volume + and Volume − together for at least five seconds to clear pairings. If it crashes, hold the power button for eight seconds or use the reset hole on the back.
