The ACEFAST K4 Go is a compact portable Bluetooth speaker designed for everyday carry. A 45 mm full-range driver with a passive bass diaphragm delivers punchy sound from a small body, while Bluetooth 5.4 ensures quick pairing and a stable link. With an IPX7 waterproof build, a portable strap, and TWS pairing (link two units for true stereo), it’s ready for travel, campus, or the beach. The 900 mAh battery offers around 8 hours of playtime and recharges via USB-C in about 1.5 hours. Pocket-friendly at 100×40×78 mm and ~200 g, K4 Go is a practical choice for music on the go in Bangladesh.