Chip for Bluetooth: Jieli AC6965E Version of Bluetooth: 5.0+BR+EDR+BLE System of channels: mono Bluetooth protocols that are supported include a2dp, avctp, avrcp, hfp, spp, smp, att, gap, and att\rfcomm\sdp\l2cap profile. Bluetooth operating frequency: 60Hz to 18KHz; maximum power: 6W*1. Sensitivity of reception: < -85dBm Horn measurement: 52 x 52 mm 4Ω is the impedance. 4-5 hours of playback at 80% volume 1,200mAh is the battery's capacity. SNR: ≥68 dB Dimensions: 113*93*93 mm Standard charging input: Type-C, DC 5V, 500ma Contains Accessories: USB data cable, user manual