The T-Mobile Personal CellSpot 4G LTE Indoor cellular phone Signal Booster is a black plastic device that provides enhanced signal coverage for T-Mobile compatible phones. With a compact design and a clip mounting style, this signal booster is easy to install on walls. It includes a 4G LTE coverage unit, a window unit, a remote antenna for indoor use, and two ports for connectivity. This product is designed to improve cell phone reception and signal strength, making it a convenient solution for weak signal areas. The T-Mobile Personal CellSpot is a reliable and practical accessory for enhancing your cell phone experience.