Made of which is heat-resistant and . Can be a wonderful bedroom music speaker for you to have a great rest. Mini size and metal appearance make it become an ornament of your desk. High-strength materials, crafted workmanship, fine texture, comfortable hand feel. Built-in lithium battery, long battery life. Features - Color: Black. - Material: ABS plastic, cloth mesh, TPU. - Size: 20.80X16.70X3.15cm/8.17X6.56X1.24inch. - Power supply: rechargeable lithium battery (600 mAh) - Number of speakers: 2. - Output power: 3W*2, stereo. - Expansion storage: 32GB. - Frequency response range: 40Hz-20KHz. - Audio input: wireless. - Working distance: up to 20 meters. - Working time: up to 10 hours. - Speaker unit: Φ33 internal magnetic impedance 4. - Around the neck design, built-in microphone, with hands-free (phone) function; with 2 passive radiators, bass enhancement. - up to 20m wireless playback distance, suitable for home, office, car, etc. - Good workmanship and outstanding sound quality, stylish and practical. - Three-button control allows you to call, tracks; reading and playing music. - Wireless connection, enjoy the joy at any time, convenient and fashionable. Package list: 1 x wireless speaker