Seeed Studio
Seeed Studio 317030213 Bluetooth Chip BT 4.2. Bluetooth Class: Class 1. Maximum Output Power: +4dBm. Receiver Sensitivity: -89dBm. Dimensions: 16 x 10 x 2.2mm. Height: 2.2mm. Length: 16mm. Maximum Operating Temperature: +85°C. Minimum Operating Temperature: -40°C. Width: 10mm.