ACEFAST Portable Speaker K4 Go

Sound Configuration: Features a 45mm full-range driver paired with a 35x60mm passive diaphragm to deliver balanced sound with enhanced bass for its size.

Power Output: Delivers a 5W peak power (4W rated).

True Wireless Stereo (TWS): Supports pairing two K4 Go units together to create an immersive, true stereo soundstage.

Waterproof Rating: Boasts an IPX7 rating, meaning it can withstand full immersion in up to 1 meter of water for 30 minutes—ideal for poolside or beach use.

Compact Build: Weighs approximately 200g and measures 100 x 40 x 78 mm, making it small enough to fit in a pocket.

Hanging Strap: Includes a built-in lanyard for securing to backpacks or hiking gear during outdoor adventures.

Playtime: Provides up to 8 hours of continuous music playback (at 50% volume) on a single charge.

Fast Charging: Recharges fully in about 1.5 hours via its USB-C port.

Wireless Standard: Utilizes Bluetooth 5.4 (some listings note 5.3) for a stable connection up to 10 meters.

Additional Inputs: Some versions include support for TF card playback and an AUX port.