The Suunto Sonic use an open-ear, bone conduction fit and are configured as a neckband design with wingtips included for added stability during wear. They weigh 31g and carry an IP55 rating, making them water resistant, though they are not fully waterless — cables are present as this is not a true wireless design. Stereo speakers are built in, while there is no display, no RGB lighting, and no UV light.
The Suunto Sonic covers a full audible frequency range of 20 Hz to 20,000 Hz with a sound pressure level of 117 dB/mW and a low impedance of 6 Ohms. Active noise cancellation, passive noise isolation, spatial audio, Dolby Atmos, Dirac Virtuo, and a neodymium magnet are all absent from the specification.
The Suunto Sonic is equipped with a rechargeable battery offering 10 hours of playback on a single charge, with a full recharge taking approximately one hour. A battery level indicator is included, while wireless charging and solar power are not supported.
The Suunto Sonic connects wirelessly via Bluetooth 5.2 with a maximum range of 10 metres, and supports aptX Adaptive as its sole advanced audio codec — LDAC, LDHC, AAC, aptX, aptX HD, aptX Low Latency, aptX Lossless, aptX Voice, and Bluetooth LE Audio are all absent. Fast pairing, NFC pairing, Auracast, and USB Type-C are not available.
The Suunto Sonic supports fast charging and can connect to two devices simultaneously via multipoint, with controls handled through a panel mounted on the device itself rather than an in-line panel. It can function as a headset and includes voice prompts and a mute function for call and audio management. Ambient sound mode, in/on-ear detection, notification readout, a find-device feature, a travel bag, a temperature sensor, and a camera remote are all absent.
The Suunto Sonic is fitted with a noise-canceling microphone, helping to reduce background noise during calls and voice communication.