The HXSJ Air-S4 are Bluetooth 5.1 true wireless earbuds with a compact charging case designed for everyday listening, calls, and hands-free use.
Use these earbuds for commuting, short workouts, study sessions, and remote calls where quick pairing and pocketable charging matter; they work with smartphones, tablets, and laptops that support Bluetooth.
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Wireless standard: Bluetooth 5.1 for stable pairing up to 15 m and reduced dropouts in typical urban environments.
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Driver size: 13 mm dynamic drivers tuned for balanced midrange and clear voice during calls.
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Battery and charging: Earbuds provide up to 2.5 hours per charge; 200 mAh case offers three additional recharges for extended day use.
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Portability: Case measures 4.4 × 4.3 × 2.1 cm; each earbud weighs 7 g for discreet carry and low in-ear weight.
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Hands-free use: Built-in mic and simple touch controls for call handling and media playback without reaching for your device.
Light specifications: Bluetooth 5.1; 13 mm drivers; 7 g per earbud; 200 mAh case; 15 m range.
Fit statement: Low-profile in-ear design sits securely for most ear shapes; users sensitive to tight seals may prefer alternate tips.
