Premium Portable Rechargeable Bluetooth Speaker - Rechargeable battery plays for up to 12 hours Bluetooth: 2.1 EDR, compatible to A2DP. Range: 10 meters in open space Speaker Size: 40mm. Frequency Range: 65Hz-20KHz. SNR: 86 dB. Very well definied audio quality relative to size. Audio clarity is our topmost goal. Distortion: 0.5% 1W 1KHz. Battery Capacity: 600 mAh. Power Output: 3 Watts Rated Voltage: 5V DC. Dimensions: 3.5" x 3.5" x 3.6" 2 beeps indicates speaker is ready to pair with Bluetooth music playback device, 1 beep indicates pairing is successful and it's ready for music playback.