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Specifications: - Bluetooth version: Bluetooth v4.1 + EDR - Output Power: 30mW - Operating Voltage Range: 3.0V-4.2V - Using A2DP/AVRCP quality stereo audio transmission and remote control protocols - Charging time: 1 hour - Product Size: Length 25MM. Width 15MM. 35mm high - Conversation or music time: 4-5 hours - Standby time is approximately 120 hours How to use this Bluetooth headset: 1. Press and hold the multi-function buttons on both earbuds at the same time until the blue and red LEDs flash alternately, and you hear a "power on" sound. 2. Tap the multi-function buttons on both sides for 2 seconds to enter the TWS pairing state. The prompt "Connect" or "Pairing" will appear. 3, open the phone Bluetooth and search for 'i7s' to connect. When the LEDs flash slowly in blue, they successfully pair. Package includes: A pair of mini bluetooth headsets (2, left and right) 1 charging box 1 USB charging cable 1 *User Manual