LCD DisplaySmart LCD screen shows caller ID, audio playback/pause, track navigation, and battery level at a glance. Long-lasting Battery20 minutes of charging provides up to 20 hours of talk time, ensuring extended use. ENC Noise ReductionEnhanced noise cancellation technology ensures stable transmission and clear calls. Dual Device ConnectivitySupports simultaneous connection to two phones for efficient multitasking. Versatile FeaturesIncludes vibration alerts for incoming calls, voice number announcement, and phone camera assistance (phone dependent). Voice PromptOffers voice prompts in both Chinese and English for user convenience. Clip-on DesignBusiness-style clip-on earphone ideal for cycling and other activities requiring secure fit. Specifications: Model: K89 Bluetooth-compatible Version: 5.4 Transmission Range: 10 meters Audio Transmission: Class 2 (-6dbm - 4dbm) Charging Voltage: DC 5V Working Voltage: 3.7V (3.3-4.2V) Battery Capacity: 140mAh Charging Time: Approximately 20 minutes Music Playback Time: Approximately 20 hours Talk Time: Approximately 20 hours Standby Time: About 180 hours (connected state) Charging Interface: Type-C