... size. 2,Rechargeable polymer battery. 3,Led lighting. 4,Power 1. Product Specifications: Bluetooth Specification:V2.1+EDR Frequency Working ... 2.402GHz ~ 2.480GHz unlicensed ISM band Output Power: Class2, Maximum connection distance:10 meter Supported Profiles: HSP ,HFP 1.5 ,A2DP ... last for 3 seconds, it will twinkle.) Function 3, Power bank( To charge for mobile phone with 2200mah capacity) Function4 ...