EMP Generator produces a high-frequency electromagnetic waves field. An energy-saving lamp around generator induces electromagnetic waves and generates an electric current. When electric energy is sufficient, lightbulb will light up. It can also be used to check quality of fingerprint locks. Features: Compact size for easy carrying and operation. It can be used to check quality of lightbulbs or fingerprint locks. Plug-in emitting heads, triode can switch by yourself. High frequency , fine effect, more stable. coil can be adjusted by yourself. If coil is reduced, will be reduced, otherwise, will be increased. Specifications: Plug: -plug Main color: black Material: plastics+metal Battery: 3.7V, 250mAh Host size: 85 * 50 * 21mm / 3.3 * 2.0 * 0.8in Package size: 150 * 102 * 40mm / 5.9 * 4.0 * 1.6in Package weight: 185g / 6.5ounce Packing List: 1 * Electromagnetic Pulse Generator 1 * Plug 1 * User Manual 1 * Triode Compact size for easy carrying and operation. It can be used to check the quality of lightbulbs or fingerprint locks. High frequency power, fine effect, more stable. Plug-in emitting heads, triode can switch by yourself. The coil can be adjusted by yourself. If the coil is reduced, the power will be reduced, otherwise, the power will be increased.