Specifications: Version (main unit): Bluetooth Standard Ver.5.0, Class 2, Search Device Name: A-S SP-16, Transmission Distance (main unit): Up to 32.8 ft (10 m) (varies depending on usage conditions and environmental conditions), Body Weight: Approx. 10.6 oz (300 g), Speaker Diameter: 1.2 inches (30 mm) x 2, Playback frequency (main unit): 80,0000000000000 mm). ):3W x 2. Power supply: DC 3.7 V built-in lithium-ion battery 1,000 mAh; Charging time (main unit): Approx. 2.5 hours (may vary depending on charging device), Continuous playback time (main unit): Approx. 9 hours (may vary depending on usage and environmental conditions), Transmission distance (transmitter): Up to approx. 32.8 ft (10 m) (depending on usage and environmental conditions). Accessories: Bluetooth transmitter). .5mm