2013 Bluetooth Mini Speaker/Bluetooth Vibration Mini Speaker/Mini Bluetooth Speaker
Best Outdoor Wireless Bluetooth speaker with USB and battery power supply: 

Frequency:160Hz-20KHz	Metallic Design
Output Power:2.0W	Portable Design
Noise Ratio:≥90 db	Wireless bluetooth audio transmission
Charging Voltage:5V	Many classic colors for choice
Working Voltage:3.7V	LINE connection
Speaker:4Ω 3W	Hands-free
Total Harmonic Distortion(THD):≤0.1% 1KHz/1.8W	Support TF card and MP3 play
Size:φ74mm*H45.5mm	With FM function
Bluetooth Distance:10M

Products details of Best Outdoor Wireless Bluetooth speaker with USB and battery power supply:

1.Power supplier: lithium battery:3.7-4 .2 V  DC:5V ,600MA Li-ion battery                 
2.Work current: <30mA (Bluetooth module)
3.Work current: <400mA (power amplifier, Bluetooth )  
4.Standby current: <3mA
5.Frequency range :2.401-2 .480 GHz (2.4GHz ISM Segment)
6.The receiver sensitivity: <-90dBm, BER <0.1%*SNR: 95dB                    
7.Distortion: <0.2%
8.Frequency Response: 20HZ-20kHZ

Feature of Best Outdoor Wireless Bluetooth speaker with USB and battery power supply:
1.Scope: <10 meters of wireless communication (consistent with the Bluetooth protocol specifications CLASS 2)
2.Transmit power: Class2   less than 4dbm, low radiation.
3.Spread spectrum: Frequency Hopping Spread Spectrum
4.Bluetooth version: compatible with V2.1, V2.0, V1.1 and V1.2 standard.
5.Bluetooth protocol support: A2DP, AVRCP.