SM02 TWS Bluetooth Headphones Mini Sleep Earbuds Digital Display Wireless Headset - Black r n r nAdvanced wireless 5.3 transmission technology, 10 meters transmission distance, stable connection without delay r n r nAudio and video synchronization, no sense of delay, providing excellent gaming experience r n r nSmall earphone cavity built-in 10mm large moving coil unit, the bass performance is more amazing, with high-sensitivity composite diaphragm to show rich music details, to achieve a soft sound experience r n r nWith an intelligent digital display, real-time display of the headset's battery and the charging compartment's battery r n r nWith bionic ear surface design, naturally fits the ears, side sleeping with headphones does not feel pressure and discomfort r n r nSpecification: r n r nChip: JL r n r nBluetooth version: 5.3 r n r nSpeaker size: 10mm r n r nHeadphone battery: 30mAh r n r nCompartment battery: 200mAh r n r nMusic time: about 7 hours r n r nHeadphone charging time: about 40 minutes r n r nCharging time in charging compartment: about 1 hour r n r nCommunication distance: 10m r n r nCharging interface: Type-C r n r nCharging voltage: DC5V/1A r n r n r nPackage includes: r n r n1 x pair of Bluetooth headphones r n r n1 x Charging case r n r n1 x Charging cable r n r n1 x English user manual r n r nIn ear for sleeping with Sleep Headphones Bluetooth Headphones - Black