The Inkbird BG-BT1W is a fully wire-free thermometer which uses Bluetooth 5.0 to pair with your smartphone. The dual sensors provide readings for both ambient and internal temperatures. Probe battery lasts up to 8 hours continuous use with a recharge time of 30 mins. Charging dock runs on a single AAA battery and will recharge probe up to 50 times. Dishwasher safe and made of stainless steel with heat resistant handle. 30m / 100ft range.