inputs.text: itrack20 - received product 12 sept 2013 took days product familiarisation main thing fully charge device insert prepaid sim card switch good go gsm signal ok gps signal tricky signal easily obstructed placement tracker covert use tricky still experimentingthe unit goes sleep mode 5 minutes conserve power reactivated within 40 seconds call sms power easily last beyond 1 week normal use sufficient condition leave another feedback 12 months later actual long power last normal use fully charge unit seller claim 60 days use simply calling unit receive sms indicating coordinates current position device current gps signal lost last known coordinates lost signal given occasionally no gps signal get no coordinates sms reply lac not know lacby today 18 oct 2013 safely confirm unit power easily last 40 days fully charged power may drop around 25 possibly last another week gps signal adequate provided no obstruction tall buildings basement etc