Double horn + single diaphragmBluetooth version: Bluetooth V5.0 Jerry 5.0Battery capacity: 18650 (1500mah) -3.7vCall / music duration: about hours (default volume 80%)Support protocol: A2DP AVRCP, HFP, HSPBluetooth frequency: 2.402-2.480ghzReceiving sensitivity: - 80bbmInput charging standard: Micro USB, dc5v/0.5-1aCharging time: about hoursEffective distance: less than 10 m (no obstacle to the equipment)Best call distance: less than 1 meterMaximum power: 5W * 2Speaker unit: speaker diameter 57mm*2Function: support playing tfcard, U-disk (128g-max). Aux playback is supportedSize: 25.5 * 10 * 13.3mm weight: 903 G