"This super small mono amplifier is surprisingly powerful.
It can deliver up to 2.5 watts for speakers with 4-8 ohms impedance.
filterless design with ferrite bead and capacitors from the outputsupply voltage: 5 Vfixed 24 dB gainonBoard trimming potentiometer for controlling the input volumeProtection against thermal overload, short-circuit and overcurrent Dimensions: 24 x 15 x 2 mm"