“N9 2 Mic Automatic Monitoring Listening Devices in Acoustic Alarm Mini Elderly and Children Caring Device Voice System” 45dB audio and away 4meter if there are sound it will call you and and you can listen in.
Basically the way this device work is, you can place it anywhere and when it detect audio or any sound that is 45dB or so, it will dial your mobile phone and you can listen in. So I think this is a great device, it’s small compact and rechargeable or you can plug into any typical phone charger port to have it on 24hours a day. I think it’s great $10 gadget, just that you may need to get a simcard that may cost you some money for having voice service, prepaid such as usmobile $5 a month, or cheaper based on how much usage you have.
Card compatible: GSM / SIM
Microphone Range (meter): 5-7 Radius
Receive sensitivity: about 10K GPRS
Working temp: -40 to 50℃
Responding frequency: 1.2K-800Khz
Stand-by time: 3-5 days (without voice control), 10-15 days (without voice control)
Work frequency: 850MHz, 900MHz, 1800MHz, 1900MHz (please check if it can work with your local system format before purchasing)
Battery: 1 * 3.7V, 300mAh Li-ion battery
Item size: 35 * 20 * 14mm / 1.4 * 0.8 * 0.6in
Item weight: 25g / 0.9ounce
Package size: 60 * 60 * 30mm / 2.4 * 2.4 * 1.2in
Package weight: 28g / 1.0ounce
You can buy this online such as ebay, cheaper from china, if you buy from usa seller it’s pretty much same quality except cost a bit higher, so if you don’t mind waiting for a few weeks, china is a bargain, just keep track make sure you will get it by setting up google reminder in a few weeks to check the shipment status, request refund if you don’t get it in a month or so.