1It is widely used to monitor the transportation and storage process of food, medicine and chemical products. 2It can view data on mobile device up to 30m/98.4ft away. 3It has small and compact size, easy to carry. 4With large storage space, it can store 15,000 data. 5The battery is powered by CR2450 battery with longer endurance. Condition: 100% Item Type: Bluetooth Temperature Data Logger Material: Plastic Color: As shown in the picture v:* {behavior:url( default VML);}o:* {behavior:url( default VML);}x:* {behavior:url( default VML);}.shape {behavior:url( default VML);} Item Characteristic Signal transmission frequency 2.400 - 2.4835GHz Protocol standard Bluetooth 4.0 Modulation system GFSK interval 10s-24h can be set continuously Built-in battery CR2450 maximum transmission distance 30m/98.4ft Storage space 256K, can store 15000 data Battery life 10 months (replaceable battery, depending on working mode) Weight 25g/0.9oz Size 50x35x15mm / 2.0x1.4x0.6in Temperature detection range -20~+60 Temperature detectionaccuracy 0.5 border: 1px solid000important;}1 x Bluetooth Temperature Data Logger1. Please allow 1-2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.