I opened it and tried it once indoors, and have been storing it indoors since then. These are completely wireless earphones that have it all: "sound," "fit," and "ease of use," with fatigue-free noise canceling and natural ambient sound capture. - Model Name: UZURA - Bluetooth Version: Bluetooth 5.2 - Battery Life (Earphones): Up to 4 hours - Battery Life (Charging Case): Up to 45 hours - Charging Time: Approximately 1.5 hours - Sound Tuning: By final - Color: MINT - Supported Codecs: SBC, AAC ・Accessories Charging case, final ear tips TYPE E (SS/S/M/L/LL), USB Type-C charging cable IPX4 water resistance for peace of mind even with sudden weather changes. You can use them without stress on rainy days or during sports. Both the main unit and the charging case have an original powder snow coating to prevent fingerprint smudges. The compact earphone body, which supports touch operation, uses a "3D fit design" for comfortable wearing in any ear canal. It also features "auto-pairing," which starts pairing just by opening the charging case, and "single-ear mode," which automatically switches when you return one earphone to the charging case. And the sound quality is high-quality, by the audio brand final. It's a natural sound quality that you'll want to listen to every day. These are just-right earphones that add noise canceling and ambient sound capture to the basic performance required of completely wireless earphones: "sound," "fit," and "ease of use." Simply returning one earphone to the case automatically switches to "single-ear mode" without interrupting the music. *1. In "single-ear mode," the playback switches from stereo to mono *2, so you won't feel any discomfort when enjoying music with one ear. For example, it's useful when you want to enjoy music without shutting out external sounds, such as while cooking. *1 "Single-ear mode" is only supported during music playback. *2 Mono playback is a method where the left and right sounds are played from one speaker. Thank you for viewing.