Product Name: Bluetooth-Compatible Handset Working Voltage: DC 4V Battery Capacity: 200mAh Talk Time: Up to 12 hours Standby Time: Up to 36 hours Charger Input: DC 5V, 300mA Frequency Range: 2404-2479 MHz Communication Distance: Up to 10 meters (open area) Charging Time: Approximately 2 hours Product Features: 1. Power On: Press and hold the function button until the blue and red indicator lights flash simultaneously to turn on the device. 2. Bluetooth Pairing: a. Enable Bluetooth on your mobile phone. b. Set the phone to search for new devices. c. Select the available device named "NFXSL" from the list. Once connected, the blue light will flash steadily to confirm successful pairing. 3. Answer Incoming Call: When receiving a call, press the function button once to answer. 4. End Call: Press the function button once to end an ongoing call. 5. Reject Incoming Call: Press and hold the function button for 2 seconds to decline an incoming call. 6. Redial Function: Double-click the function button or press and hold it for 2 seconds to redial the last number. 7. Power Off: Press and hold the function button until the red light turns on, then release to power off the device. 8. Charging Information: While charging, the indicator light glows red. When fully charged, the red light turns off and the blue light remains steadily illuminated. Initial charge time is approximately 2 hours. Package Includes: 1 x Bluetooth-Compatible Handset 1 x USB Charging Cable 1 x Packaging Box Note: 1. Due to manual measurement, please allow a slight variation of 1-3 cm. Confirm you are comfortable with this before purchasing. 2. The actual product color may vary slightly due to differences in screen display settings.