1. Professional DSP chip, intelligent optimize sound, effective noise reduction 2. 9.7mm cardioid directional, highly sensitive pickup 3. Compatible with a variety of mainstream music platforms and K song software 4. 4 hours long battery life (70% volume) 5. Bluetooth version: BT5.0 6. Battery: 3.7V 1500mAh 7. Rated input: 5V 1A 8. Charging port: Type-CSpecification: Package Weight One Package Weight 0.45kgs / 1.00lb One Package Size 30cm * 12cm * 12cm / 11.81inch * 4.72inch * 4.72inch Qty per Carton 20 Carton Weight 9.50kgs / 20.94lb Carton Size 60cm * 50cm * 32cm / 23.62inch * 19.69inch * 12.6inch Loading Container 20GP: 277 cartons * 20 pcs = 5540 pcs 40HQ: 644 cartons * 20 pcs = 12880 pcs