Features: Enjoy music wirelessly outdoors with a carabiner. IPX5 water resistant (water repellent). Not fully waterproof. Micro USB rechargeable; Deep bass & high sound quality; Official Bluetooth licensed product; Specifications: Power supply: DC 5V (USB powered/micro USB input terminal); Built-in battery: Rechargeable lithium polymer battery (3.7 V 500 mAh); Maximum practical output: 3 W; Playback frequency band: 150 Hz - 17 KHz; Speaker: Diameter: 1.6 inches (40 mm) 2 Signal to Noise Ratio: ≥ 80 dB; Communication Method: Bluetooth Standard Ver.4.0; Supported Profiles: A2DP, AVRCP; Modulation System/Frequency Band: FHSS/2.402 - 2.480 GHz; Maximum Transmission Distance: About 32.8 ft (10 m) (Class 2); Charging Time: About 2 hours (from zero to full charge). Music playback time: About 10 hours 50% volume) ■ Operating Environment: Temperature: 32 - 104°F (0 - 40°C), Humidity: 20 - 80% (but without condensation); External Dimensions: Width 3.6 x Height 3.5 x Depth 1.7 inches (92 x 89 x 43 mm); Weight: Approx. 4.6 oz (131 g); Accessories: Dedicated charging cord, carabiner, instruction manual (English language not guaranteed); Note: Charging time, music playback time and maximum transmission distance may vary depending on the situation. Charging time may be longer (or shorter ) depending on the capacity of the charger. Specifications and appearance may be altered without prior notice in order to make improvements. Bluetooth and Bluetooth logos are trademarks of Bluetooth SIG INC. and we use this product under license. The system names and product names listed are generally trademarks or registered trademarks of their respective companies.