With A Volume Control Potentiometer, Devmo 2Pcs Pam8403 3W Stereo Audio Power 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