The ATH-CKS30TW Plus are true wireless in-ear earbuds with no cables or neckband, weighing just 9 g per unit, which keeps them light during extended wear. They carry an IP55 rating with sweat resistance, making them suitable for use during physical activity. Stereo speakers are present, but no wingtips are included for additional ear stability.
The ATH-CKS30TW Plus include both active noise cancellation and passive noise isolation, giving them two layers of background noise reduction. The 9 mm drivers cover a frequency range of 5 Hz to 20,000 Hz, with an impedance of 20 Ohms and a sound pressure level of 110 dB/mW. The earbuds do not use a neodymium magnet in their driver construction.
The ATH-CKS30TW Plus offer 7.5 hours of battery life per charge, dropping to 6.5 hours when ANC is active, with the charging case contributing an additional 12.5 hours for a combined total of 20 hours. A full charge takes 2.5 hours, and a battery level indicator is present to help track remaining power. The battery is rechargeable, but wireless charging is not supported.
The ATH-CKS30TW Plus connect wirelessly via Bluetooth 5.1 with a maximum range of 10 m, supporting the AAC codec and fast pairing for quicker device connections. The charging case uses USB Type-C for wired charging, though NFC pairing is not available. On the codec side, the earbuds do not support LDAC, LDHC, aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, or aptX Voice, keeping the wireless audio options limited to AAC and the standard Bluetooth audio stack.
The ATH-CKS30TW Plus support multipoint pairing with up to two devices simultaneously, along with ambient sound mode for environmental awareness and a find-device feature for locating misplaced earbuds. Fast charging is available, and controls are handled via a panel on the earbuds themselves rather than an in-line remote. The earbuds can function as a headset for calls, include a mute function, and provide voice prompts for audio feedback. A travel bag is included in the box, while in-ear detection and a body temperature sensor are both absent.
The ATH-CKS30TW Plus feature a noise-canceling microphone for call use, with a frequency response ranging from 100 Hz to 8,000 Hz, covering the range typically associated with voice clarity in everyday calls.