The Energy Sistem Serenity ANC adopt an in-ear fit and operate as fully true wireless earbuds, meaning there are no cables or cords involved. They carry an IPX4 ingress protection rating, which translates to resistance against sweat, making them reasonably suited for physical activity. The design does not include a neckband or wingtips, keeping the form factor minimal, and stereo playback is supported across both earbuds.
The Serenity ANC includes both active noise cancellation and passive noise reduction, offering two layers of sound isolation during use. Each earbud uses a 10 mm driver unit and covers a frequency range of 20 Hz to 20,000 Hz, which spans the standard limits of human hearing. Impedance is rated at 32 Ohms, and the drivers do not use a neodymium magnet.
Each earbud holds a 40 mAh rechargeable battery delivering 5 hours of playback, with that figure remaining the same when ANC is active. The accompanying charging case carries a 500 mAh cell that adds a further 20 hours of charge, bringing the combined total to 25 hours before needing a power source. A full charge takes around 1 hour, and a battery level indicator is included to help track remaining power. Wireless charging is not supported, so the case relies solely on a wired connection to recharge.
The Serenity ANC connects wirelessly via Bluetooth 5.4, with a stated maximum range of 20 meters and an audio latency of 200 ms. Neither fast pairing nor NFC pairing is supported, so connections follow the standard Bluetooth pairing process. On the codec side, AAC, LDAC, LDHC, and the full range of aptX variants — including aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, and aptX Voice — are all absent, meaning the earbuds rely on the baseline SBC codec for audio transmission. The charging case uses USB Type-C for wired charging, and the earbuds can be used wirelessly during playback.
The Serenity ANC supports multipoint connection for up to two devices simultaneously, and an ambient sound mode lets users pipe in environmental audio without removing the earbuds. Fast charging is available, and the earbuds can also function as a headset for calls, aided by a mute function and voice prompts for audio feedback during use. Controls are handled through a panel placed on the device itself rather than an in-line remote on a cable. A travel bag is included in the box for portability, while features such as in-ear detection, a find-device function, and a body temperature sensor are not present.
The Serenity ANC is equipped with a total of four microphones, and the setup includes noise cancellation on the mic side to help reduce background interference during calls and voice use.
