Syllable D900S Mini Wireless Bluetooth Apt-x IPX4 Waterproof Earbud In-ear Noise Cancelling Earphone Headset HeadphoneFeatures: Designed for music entertainmentSyllable D900S Bluetooth wireless earbuds for music and callsCompact size、 easy to carryLonger standbyThe updated version of D900、 provides more stable signal and longer standby timeApt-x soundSupports apt-x sound effect、 offer the Hi-Fi tone qualityIPX4 WaterproofIPX4 waterproof、 impervious to sweat and rainCome with intelligent charging box for continuous useD900S wireless earbuds adopts the exclusive Multiplex Link composite connection technology of Syllable for absolute wireless connection. Without limit of cable、 just enjoy the music freely while doing sports.Specification:           General           Brand       Syllable           Model       D900S           Material       PC+ABS           Specification           Bluetooth       V4.0  CSR8670           Supported protocols       ACRCP A2DP HSP HFP Aptx           Connection distance       10m           Impedance       16 ohms           Battery capacity       65mA           Microphone Sensitivity       -42dB+\/-3dB           Life time       4H(Battery case can provide 6 times change)           Function calls       listen to music           Standby time       90h           Charging Time (h)       2 hours           Talking Time       4 hours           Music Time       4 hours           Waterproof grade       IPX4           Frequency response       20-20000Hz           Charging Voitage       5V           Product Weight       0.008 kg           Product Size (L x W x H)       2.00 x 2.00 x 2.70 cm \/ 0.79 x 0.79 x 1.06 inch   Package Included: 1 Pair Syllable D900S Waterproof Bluetooth Headset1 x Intelligent Charging Box