Field strength testing tool swView 868 MHz Power supply 24V DC for Wireless repeater RF Rx RF 10 H SW915 ET lithium battery CR2032 3V/230mAh (5 Pieces) RF 13 W SW915 with energy generator RF 13 R SW915 with energy generator RF 13 WH SW915 with energy generator RF 13 D SW915 with energy generator RF 13 DS SW915 with energy generator RF 95 W LR SW915 with energy generator RF 95 WK LR SW915 with energy generator RF 95 R LR SW915 with energy generator RF 95 RL LR SW915 with energy generator RF 95 WH LR SW915 with energy generator RF 95 WHM LR SW915 with energy generator RF 95 WHLM LR SW915 with energy generator