Features: 1. The latest version of the Bluetooth chip, V5.0 + EDR, provides stable performance. 2. Supports voice prompts. 3. Features automatic power-on and power-off functionality for convenience. 4. 550 mAh battery capacity. 5. Call duration of up to approximately 10 hours. Handsfree Car Speaker Kit for Cell Phone Advanced multi-point connection supports two mobile phones connected simultaneously. Built-in DSP noise suppression and echo cancellation technology. Specifications: Bluetooth transmission distance: 10M Speaker output: 42W, high-definition stereo sound Dimensions: approximately 100 x 60 x 21mm / 3.94 x 2.36 x 0.83in Color: Black Charging time: approximately 2 hours Battery capacity: 550 mAh Call time: approximately 10 hours Standby time: up to 500 hours Bluetooth version: V5.0 + EDR Transmission distance: 10M Package Included: 1 x Car charger Notes: 1. Due to differences in monitors, the image may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Please allow slight dimensional differences due to manual measurement.