1. Reverb mode: echo in effect reverb 2. Material: ABS 3. Charging power: DC5V 4. Battery capacity: 1800mAh 5. Output power: 10mW (headphone output), 4W (speaker output) 6. Pickup: condenser type 7. Bluetooth version: 5.3 8. Frequency range: 100Hz-10KHz 9. Size: about 22.1 x 7.6 x 6.2cm 10. Weight: about 340g Features: 1. Built-in high-capacity lithium battery, lasting life 2. Multi-mode playback, AUX, headphones, TF card, U disk socket 3. Wireless Bluetooth, compatible with smart phones, laptops, tablets, TV, support a variety of K Song APP 4. Bluetooth stable connection, monitor ear, listen and sing, HIFI speakers, cell phone APP recording songs, reverb adjustment 5. Wings can be disassembled, DIY stickers