Awei Y900 Wireless Portable Bluetooth Speaker with Built-in Microphone Built-in Microphone Bluetooth Version : V4.2 + EDR Audio Input : Bluetooth, TF Card Speaker Diameter : 40mm 4Ω 3W Dual Speaker Power Output : MAX 4.5W SNR : ≥80dB Distortion : <1% Frequency Response : 80Hz-20KHz Battery Capacity : 1200mAh 3.7V Music Playing Time : 3 - 5 hours Charging Time : 2 - 3 hours Bluetooth Transmission Distance : 8M 5+5