Driver unit: 40mm speaker Wireless version: Bluetooth V5.0 (JL chipset) Compatible protocols: A2DP AVRCP HSP HFP Charging input: DC 5V; charging time approx. 2 hours Playback/call duration: up to 8 hours; standby time: about 200 hours Battery capacity: 300mAh Grade A polymer battery Dimensions: 186 × 180 × 75 mm; Net weight: 187g Playback modes: Bluetooth / TF card / AUX input Voice prompt: when not connected double-press the M button to hear a confirmation tone