... 2. LED indication for batteries YF-P31 Portable Solar Mobile Phone Charger: Technical Parameter: 1.Solar battery power: 1.98W2 ... constant voltage.4.Auto protection function:overcharge,over discharge,overload,reverse connection,short-circuit will be protected;lighting protection and ... products.7.LED indication for batteries.8.Suitable for mobile phone,digital camera,PDA,Mp3,Mp4, IPOD,DV etc digital ...