Function introduction: Speaker type: card-type Bluetooth speaker Adjustment method: button Functional features: Bluetooth connection, card support Transmission range: up to 10 meters, the data is measured in an open and unobstructed place. (Walls and buildings may affect signal transmission) Material process: aluminum alloy Bluetooth specification: 5.0 Play time: 120GV 300MAH Play for about 1-3 hours Voltage: 3.7V Charging voltage: 5V Speaker specifications: 4Ω3W Diameter 36MM Frequency response: 20HZ-20KHZ Signal-to-noise ratio: ≥80DB Distortion: ≤1% Wireless connection: Connect to your device via Bluetooth, no wires required, easy to carry. Portable design: Small and light, convenient to carry with you for outdoor activities or travel. USB power supply: It can be powered by the USB port, which is convenient for use with various devices. Wireless connection: Connect to your device via Bluetooth, no wires required, easy to carry. Full-Range Audio Crossover: Provides a full range of sound frequencies, ensuring clear and balanced audio across all channels. Material: Plastic colour: Black Package Contents: 1 x Wireless Bluetooth Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.