<p>general<br>driver size : 30 mm / 1.18&quot; dynamic driver<br>power supply : 5 v 1 a<br>maximum operation temperature : 45 &amp;deg;c<br><br>audio<br>sensitivity : 80 db spl@1 khz<br>frequency response : 20 hz - 20 khz<br>impedance : 32 ohm<br>maximum spl : 81 db<br>microphone sensitivity : -40 dbv/pa@1 khz<br><br>dimensions<br>net weight : 122.2 g / 0.269 lbs<br>ear cushion outer length (mm) : 67.5<br>ear cushion height (mm) : 16.28<br>ear cushion inner length (mm) : 28.5<br>ear cushion inner width (mm) : 28.5<br>cable length : 20cm<br><br>control and connection<br>bluetooth version : 5.3<br>bluetooth profile : a2dp v1.4, avrcp v1.6.2, hfp v1.8<br>bluetooth transmitter frequency range : 2.4 ghz - 2.4835 ghz<br>bluetooth transmitter power : (eirp)<br>bluetooth transmitter modulation : gfsk, &amp;pi;/4 dqpsk, 8dpsk<br>supported formats : .mp3, .wav, .wma, .flac<br><br>battery<br>battery type : lithium-ion battery (500 mah / 3.7 v)<br>charging time : &lt; 2 hrs from empty<br>music playtime with bt on : up to 50 hrs<br>talk time : up to 29 hrs<br><br>what's in the box<br>1 x jbl jr 320bt headphones<br>1 x usb type-c charging case<br>1 x sticker sheet</p> <p>JBL Junior 320BT headphones offer safe, customizable sound (max 85dB), a 50-hour battery, built-in mic, and a kid-friendly, personalized design.</p> <p>Store in a cool dry place.</p> <p>China</p>