Features: 1. High-definition magnification 3 times, 1:1 detail magnification and restoration, far away from myopia, big-screen drama is more enjoyable, anytime, anywhere, cinema-style movie viewing experience, synchronized screen full screen full screen, comfortable viewing 2. Wireless Bluetooth audio, powerful bass and surging sound effects, speaker + diaphragm, the original sound experience is full and clear, feels the beating of notes, thickened Fresnel lens, anti-blue light upgrade again, the picture is high-definition not easy to be distorted, and the true color is restored 3. Compatible with most smart phones above 4.0, Bluetooth one-button connection and ready to use, folding storage, light and convenient to carry, folding storage type, to protect the lens from damage, easy operation 4. Pull-out form design: hide the glass panel, reduce daily wear and tear, convenient storage, no space, multi-function operation buttons, diverse functions, one-key operation, to meet your different needs 5. Removable large-capacity battery, large-capacity 18650 battery, to meet your long-term use needs Specifications： Product name: 12-inch pull-out Bluetooth audio mobile phone amplifier Product size: 260X210X53MM Product color: dazzling black, milky white Product function: audio/amplification/eye protection/bracket Product material: ABS+Fresnel lens Magnification: 3-4 times Battery information: 18650 lithium battery (without battery) Package includes: 1*bracket audio amplifier 1*USB data cable 1*Instruction Manufacturer Information: Company: BLACKSTONE ELECTRONICS CO LIMITED Address: UNIT D12 ON 16TH FLOOR JING HO INDUSTRIAL BLDG NOS.78-84 WANG LUNG ST TSUEN WAN NT Email: black_stoner@outlook.com Tel: +8618123753837