This is a compact size guitar headphone amplifier with a 1/4" plug. You can use it to guitar and listen via headphone. You can also add stomp boxes into the link. Enjoy it!<br> <br> <strong>Features:</strong><br> Tiny size， ultra light weight with a 1/4" plug.<br> Auto switch on/off detecting headphone jack (3.5 mm).<br> Built-in LED indicator: working (green)， charging (red).<br> Hi-Fi IC employed， keep original sound of guitars.<br> Rechargeable， can be charged by the included mini USB cable.<br> Compatible with bass guitars.<br> <br> <strong>Specification:</strong><br> Material: Plastic<br> Output Power: 250mW (8 ohm)， 100mW (32 ohm)<br> Frequency Response: 10 Hz - 40 kHz<br> Battery: Li-ion battery<br> Item Size: 6.1 * 4 * 1.5cm / 2.4 * 1.5 * 0.6in<br> Item Weight: 13g /0.5oz<br> Package Size: 7 * 4.5 * 3cm / 2.7 * 1.7 * 1.1in<br> Package Weight: 30g / 1.1oz <br> <br> <strong>Package List:</strong><br> 1 * Audio Headplug<br> 1 * USB Mini Cable