... smallest size, 500 /1000m transmission**Portable battery charger Product SpecificationBuilt-in rechargeable lithium battery (7200mAH/3.7V);Input voltage: ... batteryThe products is a commercial portable power with high capacity build-in lithium battery, it could be used as ... phone, iPOD, iPhone, PSP, PMP, MP3, MP4,DVR, portable DVD, pocket mini projector, PDA, walkie talkie, Illumination lighting, ...