a.4 in 1 (Keychain, necklace, watch design with LED torch) 1.The mosquito repeller uses an advanced technolgy insect repellent that makes outdoor living and activities more enjoyable from the annoyance of mosquitoes. It works to help protct you while you're fishing, camping, hiking, jogging, on the golf course, or just at ease on your patio or porch. 2.Uses CR2032 battery 3.Male mosquito setting 4.Dragon fly setting(very slight sound) b.Pacing details: each in polybag, 120pcs/inner box, 480pcs/CTN, N.W./G.W.:14.5/15.5kgs, Measurement: 33*25.6*26cm