mode and Music mode, in both of which EQ algorithm optimizes the audio quality, bringing non-perceivable delay and superior audiovisual synchronization in game, music and movies. Completely free up your mind through wireless connection. It features a cool appearance with coloful light. Do not miss it.[BT 5.0 Chip] New-generation BT 5.0 enables high-speed transmission, stable connection and low power consumption, offering zero interference and maximum enjoyment.[HD Phone Call] Adopting exceptional IC-driven noise-cancelling, RF switching and EM suppression, X15 effectively optimizes communication with high audio sensitivity for Hi-Fi call.[Automatic Pairing] After the earphone is paired for the first time, it will automatically start up and connect to phone when taken out the charging bin again, fast and convenient.[Ultra-long Endurance] Equipped with a portable charging cabin, the earphones can be charged once put into it, which can offer long battery life for daily use.[LED display] LED-digital screen with indicator lights show clearly the battery charging status and remaining power of left and right earphones as well as charging case.[Universal Compatibility] X15 is widely compatible with iOS and Android systems.Specifications:Model: X15Material: ABSColor: Black BT Version: 5.0Earphone Battery: 3.7V / 40mAhCharging Box Battery: 3.7V / 350mAhCall Time: about 3HPlay Time: about 2.5HTransmission Distance: about 10MWireless Protocol: HFP/A2DP/HSP/AVRCPSpeaker Size: 12mmFrequency Response: 20Hz-20KHzItem Weight: 40g / 1.41oz (charging case included)Package Size: 14.5 * 8.2 * 3.5cm / 5.71 * 3.23 * 1.38inPackage Weight: 63g / 2.22ozPackage List:1 * BT Earphones1 * Charging Box1 * Charging Cable1 * User Manual