LED indicator light. High strength plastic, IP65 waterproof. Wireless communication include Wi-Fi, Bluetooth and LoRa. Built in 250mAh rechargeable battery, magnetic suction charging port. Built in LoRa and Wi-Fi/BLE antennas, stylish appearance, compact and light. Secondary development can be done through , Platform.io, etc. Support Heltec Wireless Boot system, download firmware, exchange information, and print logs through Wi-Fi. (Due to different product batches, the appearance , which does not affect the use) Material: Plastic colour: As shown Specification: B Package Contents: 1 x Sensor(915MHz) 1 x Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.