Features: 1. Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away. 2. Built-in explosion-proof battery: Excellent mini USB charging port, which can be charged by mobile power anytime and anywhere in an emergency. 3. Suction cup hands-free phone: with a powerful suction cup, so the speaker can be played on occasions where it can be freely absorbed. 4. Powerful: Enjoy clear and clear audio with impreive volume. Listen to all the treble and ba of your favorite tracks and enjoy great listening enjoyment. 5. Portable and stylish appearance: you can easily ride bicycles, beaches, camping or indoor showers, bringing you endle journey fun. Description: Waterproof and dustproof design, portable wirele speaker is very suitable for traveling, hiking, cycling, running, outdoor activities. Product size: 49*33MM Rated power: 3W Frequency response: 20HZ-20khz Total harmonic distortion: <1% S/N: 80DB Parameters of the speaker: 4 3W DIAMETER 36MM Battery: 3.7 V / 450 mah BLUETOOTH version: BLUETOOTH V5.0 Battery charging voltage: 5V(USB) PIAYBACK time: UP TO 4 HOURS Color: red, blue, silver, black, gold, rose gold (optional) Interface type: USB Signal to noise ratio: 80dB Version: 5.0 Effective distance: 10 meter Applicable people: universal Shell material: metal Speaker adjustment method: button Package Included: 1 * Speaker Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.