Headphone light status indication Power on: blue LED light Shutdown: red LED flashes 3 times When charging: the red LED is bright Charging completed: red LED off Pairing instructions: First paired with two Bluetooth headsets Pair the Bluetooth master device to achieve stereo The left and right ears of S2 are paired at the factory. product information: Name: (TWS)S2 Color: Chinese red, local gold, silver gun gray Technical specifications: Size: 39 × 56 × 188mm Earplug weight (each): 5g Charging box: 100 grams Output power: 5mW Channel: Stereo Distortion: THD<0.1% Frequency response: 6HZ-20kHz Signal to noise ratio: 295dB (A- Weigth) Battery capacity earlobe (each): 60mAh Charging box: 1200 mAh Battery charging time: earplugs for 90 minutes Charging box: 2 hours