Devmo 3W Stereo Audio Power Amplifier Board Module Super Mini Dc, 2Pcs Pam8403. Product Details Operating voltage: 2.5V-5.5V Speaker Load: 4-8 Ohms Size: 29 x 20 x 12.5 mm (L x W x H); 29 x 35 x 12.5 including volume control knob Volume control potentiometer shaft diameter: 6mm Net weight:8g ?Can use the computer USB port, USB power bank or a mobile phone charger to supply the 5V support power,Battery power can also be used ?Provides 3W (left channel) + 3W (right channel) output power into a 4? speaker load and 5V power supply ?Integrated power switch and volume control (turn knob fully counter-clockwise to turn off) ?Module has short-circuit current protection, under-voltage lockout and over-temperature protection (shuts down at an internal temperature of 140C +/- 15C) ?Package Includes: 2PCS PAM8403 Class D Stereo Audio Power Amplifier Module with Volume Control Potentiometer Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.